# Tagged Questions

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### Is it possible to count human with low current?

Please look at this project http://big.dk/#projects-vvv Description says "A single person can activate the beating heart, but joining hands with others will make the heart beat even faster to create ...
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### Determining resistance per load with only power and volts

I have a extra credit problem in my class and I'm slightly stumped as to where to go next after I determine the It, Et and Rt. I am starting with a total power of 2 watts and 32 volts. I know to get ...
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### Potentiometer voltage change

I'm trying to understand simple things about electricity reading allaboutcircuits.com web. This chapter includes image which´s principle I don't understand. Here it is: When supplying constant ...
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### Why does the voltage changes in this simple circuit?

I'm beginning to learn electronics, and there's something I just can't grasp. I was told that a high resistance in a circuit would lead to a smaller current passing through it, but the voltage would ...
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### Small-signal input and output resistances of the circuit

I am given this circuit: And I am trying to determine the small-signal input and output resistances. I was either given or found all the following info for the circuit: VA = 110V β = 115 T = ...
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### Mathematical approch to measuring current, voltage and resistance of mixed series and parallel

If there is a circuit like the one below, where all resistors are 1k ohm, how does one determine the currents? The voltage sources are all 10 volts. The problem I am having is that I do not know if ...
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### Potential difference across one resistor with and without a known current?

Okay imagine you have a voltage supply of 10V and one Resistor of 5 Ohms. Now find the current : I=5/10 = 0.5A So potential difference across that resistor : V=IR=10V .. which proves this statement ...
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### Help with understanding Current, Voltage and Resistance

Is my analogy correct: With a highway as an example, would Resistance (ohms) be the number for lanes in one direction Current (amps) be the density of cars on the road Voltage (volt) be the speed ...
3k views

### How to calculate current and voltage draw of a single resistor circuit?

If I have a single 270 ohm resistor connected in a circuit to a 3.3V 50mA power supply, how can I measure the voltage and current for the resistor? I'm familiar with Ohm's law V=IR, where V is the ...
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### How does audio get transmitted from my iPod to speakers?

I need some help understanding a simple concept. I understand that my iPod/any other audio device sends electrical signals to my speakers/headphones. From my research so far, an analog signal is ...
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### How do different kinds of motors behave electrically under operation?

This is sort of a follow-up to this topic: Overclocking my toothbrush I have since measured some numbers with my DMM. Remember this is a tiny brushed DC motor in a \$5 toothbrush that I am driving ...
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### Understanding electric power

While in a mood to purchase a Peltier strip, I visited the amazon page which stated the specs of a Peltier thermoelectric cooler, one stated 12 V and 92 W and other one stated 12 V and some 77 W. As ...