Questions tagged [load]

An electrical load is an electrical component or portion of a circuit that consumes electric power. This is opposed to a power source, such as a battery or generator, which produces power.

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5k views

Can I charge and discharge a NiCd/NiMh battery at the same time?

I presume there will be opposite movements of the charged particles inside, with collision energy being exhaust as heat. On the other hand, such a setup would probably introduce an extra noise/...
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3answers
11k views

Trying to determine the output of a RC-filter with load

I have a low pass filter like this: simulate this circuit – Schematic created using CircuitLab \$V_{\text{out}}\$ is measured right after \$R_1\$, which I suppose means that it is measured ...
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2answers
36k views

Constant current, constant power and constant impedance loads

Ive been looking for information on constant power, constant current and constant impedance/resistance loads, there's some information about the constant current loads, but very little that really ...
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2answers
11k views

Using TP4056 module to charge battery while load remains connected

I need a circuit that utilizes the tp4056 breakout board to power a NodeMCU ESP like so: tp4056 USB port connected: 18650 battery charging and NodeMCU running of USB tp4056 USB port not connected: ...
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2answers
3k views

Why does an induction motor draw more current when the load is increased?

I am aware that a coil has inductive reactance when powered by AC besides the еlectrical resistance which is typically very low. Considering the fact that reactance is proprotional to the inductance ...
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2answers
952 views

Is this normal Buck Regulator behaviour?

I recently got around to trying out buck regulators, my results weren't what I was expecting though. For one the ripple voltage seems a little high to me, It's about 800mV with no load and goes up to ...
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3answers
3k views

How do you drive a high current load from a moderate current source?

If I have a power supply that can supply 5A @ 12V and I need to be able to supply an inductive load with 20+A @ 12V, how would I go about this? I need a burst of current for about 2-5 seconds. Will ...
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2answers
12k views

How to calculate suitable dummy load for a power-supply?

A beginner question - feel free to shoot me down I'm looking to modify a retired AT SMPS to drive my ham-radio. This is to be achieved by tying all the +12V wires together so the maximum amperage may ...
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2answers
2k views

Load-line analysis derivation

I'm trying to get a better handle on the derivation where load-line analysis comes from. This is because I have a system that essentially has two different loads operating on a single diode and I'd ...
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3answers
258 views

Cascaded BJT Amplifier Load

In my first layout, with a 9.2k load I get a gain of ~55 (20mVpp in -> ~ 1.1Vpp out). My current understand is that if I replace the resistor load with something else that presents as 9.2k (i.e. ...
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2answers
30k views

Choosing TRIAC snubber resistor for multi-purpose switching

I'm designing a circuit to switch a 240V AC load and haven't done a lot with AC power control before. I'm planning to use a Fairchild MC3043-M optically coupled TRIAC driver along with a BT138-600 NXP ...
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3answers
12k views

Help needed optimising simple current limiting circuit

I have been experimenting with simulating current limiting circuits. I am trying to limit current to ~500mA given a fixed 4.8V source. I have started using a circuit like the one found on this ...
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7answers
58k views

How can I calculate the inductance of the primary of a transformer given a specific load on the secondary?

Inductance in the primary of a transformer decreases as the load on the secondary increases. How can I calculate the inductance of the primary coil? What if it was step up or one to one ratio?
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1answer
34k views

Effect on loading a DC motor - load torque

Could someone give a (detailed) explanation (perhaps with formulas) of how the load (torque) affects the armature current of a DC motor (separately excited or shunt or series)? As the load torque ...
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4answers
812 views

Proper ways to disconnect ICs during low power states to avoid parasitic/backfeed supply

I’m working on a low-power battery-based AVR-based project that integrates a few different devices including a neopixel strip and an Adafruit pixie. When the overall device is quiescent, I’d like it ...
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1answer
124 views

Can a solar inverter be damaged if installed capacity is much larger than demand?

I had a dispute with my fellow. In his opinion, a power inverter can be damaged if the load is much lower (e.g 100W) than installed capacity (e.g. 10kW) of the solar system. I am of the opinion that ...
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1answer
7k views

Arduino Boost Converter. Connecting load makes converter non functional

I am trying to build a DC-DC Buck-Boost Converter using this basic schematic and an Arduino with the analogWrite() function as my PWM generator. I only want to step up 2.4-3V to ~5V. If it's just the ...
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4answers
2k views

Battery mAh meaning

What exactly does mAh rating means? I know that it means the milliamperes supplied by the battery in one hour but i need a more conceptual and practical definition/example. How does mAh rating tell ...
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1answer
17k views

how to select capacitor for a crystal oscillator

Here is a 32 MHz crystal from one of TI's reference design The BOM list defines the crystal as ...
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7answers
36k views

What is a load resistor?

I am not able to understand what a load resistor is and how does it relate with a load. Can anyone explain how the load resistor works and how is it different from the general resistor.
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1answer
6k views

Does this loadcell's creep mean that I can not let a constant load on the loadcell?

I want to build a connected scale that I can set coffee powder (for example) on it and check over the internet how much of coffee I still have without going to see it. Usually all loadcells have a ...
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1answer
1k views

LTSpice: active load current generator soft saturation

I would like to use a current generator to pull down the voltage to zero (there is a voltage generator with a series resistor). The current generator models the output of a specific circuit, so it is ...
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2answers
400 views

What is the effect of heavy loads on the electrical grid?

When our neighbors turns on a motor, a bulb in our home turns off for a very very short time and then it turns on again. It is something like a quick flash but a man eye can notice it. Would you tell ...
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3answers
270 views

Mystery issue driving load through NFET with microcontroller

U1 is a microcontroller driving M1 to drive a load. I am running into some bizarre behavior and I'll try to include all the relevant information. Hope it's not too much. M1 is a logic-level FET. ...
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1answer
606 views

Problems when loading an Ultrasonic transducer (reflected power)

I have a very simple setup that is giving me problems I cannot understand: Apparently, the reflected power is the same as the power generated by the amplifier (both measured by the amplifier, ...
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2answers
3k views

How to hook up a load cell to an Instrumentation amplifier correctly

I am trying to get load cells connected to an instrumentation amplifier. The load-cells I have are extremely similar to the ones here https://www.sparkfun.com/products/10245. They have 3 wires coming ...
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4answers
10k views

Load Resistor across Crystal

What is the purpose of using a 1M Ohm resistor across crystal pins? Please refer to the image for clarity. The crystal serves as the clock source for an USB Hub device(LAN9512). There is nothing ...
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5answers
2k views

Hand crank DC generator - a simple dummy load that won't burn out?

I'm working on a project that allows a user to crank a hand generator while current and voltage sensors measure the output. After the user finishes cranking, software displays information about how ...
2
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3answers
9k views

why does the parallel resistors with voltage source can be ignored as well as resistors in series with current source in term of equivalent circuit?

I have a problem dealing with equivalent circuit. I don't know why when the resistors that is parallel with the voltage source can be ignore as well as one in series with current source. Of course the ...
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1answer
1k views

Boost Converter no load problem

This my 12V boost converter shematic and Vin voltage 6.6V to 8.4V. I use Texas Instruments LM3478 boost converter. I calculated my capacitor value, resistor value, inductor value, switching frequency ...
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2answers
239 views

Detecting when an illuminated AC doorbell is pushed

I have an 8VAC (can be switched to 12VAC if required) pushbutton bell which is in series with two "ding dong" chimes. The button is illuminated with an incandescent bulb, also in series. Pushing the ...
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2answers
2k views

Using an AC relay for DC switching, safe limits

I have an relay that's rated for a 250VAC, 16A load. Would it be possible to also use the same relay for say a 25VDC, and less than 1A load? From here, relay power ratings - AC vs DC , it seems to ...
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2answers
630 views

Different design in relay load connections

(I know, relay are drawn in the wrong way, NO contacts should be in serie with load, I'll fix it ASAP) When I have to build a board to switch many devices (mains powered), I always use a single "...
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1answer
2k views

d Solid state relay minimum load current?

I am looking at using a solid state relay to drive a tiny pneumatic valve. The SSR spec has a load current range of 0.02 to 3.5A. Most SSRs specify a maximum load current, which is obvious as to why. ...
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1answer
789 views

A question about very simple light Dimmer circuit?

I've learned that a Triac works as a switch for controlling AC current. Why not connecting the load (L1) and Triac in series? at the position of red arrow? My reason is that a small amount of current ...
0
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1answer
648 views

Shunt capacitor as discontinuity in transmission line

As in the following circuit simulate this circuit – Schematic created using CircuitLab suppose that an infinite transmission line (with characteristic impedance \$ Z_0 \$) ends upon a ...
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1answer
205 views

BJT Common Emitter - Active Load Biasing

I'm experimenting with/learning about the use of active-loads with a common emitter and I've hit a wall. When using a resistor in the collector it makes sense how the output voltage bias can be set to ...
0
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1answer
125 views

How do I calculate load resistance?

I'm here with yet another problem. This time I can't figure out what the question wants. I've calculated the Thévenin equivalent, however I can't work out how I should calculate the RL. Is the load ...
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4answers
880 views

LED on the collector without a base limiting resistor

am a beginner trying to understand transistors. I am using a npn transistor. I have a 6V battery. The base and collector are connected to 6V Emitter has the load (LED + 100ohm resistor) to the ...
0
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1answer
203 views

Relay's maximum rating current and voltage

I'm looking at this Form C relay: IXYS LCC110 Its max load current is 120 mA and max voltage is 350 VDC. My question may be dumb, but can I use this relay to safely control a load that is only 5V but ...
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1answer
366 views

Voltage source and its load resistance matching

i have implemented DAC controlled DC voltage source. I'm having trouble understanding physical reasons for voltage error due to load resistance change. My circuit desing was taken from DAC ...
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1answer
107 views

Which load resistance is connected to generator U2?

I have this op amp and one of the questions says Which load resistance is connected to generator U2? This is my attempt but I can not confirm if it right. No it's not homework, it examples I'm ...