New answers tagged resistance
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What is the equivalent resistor of different resistors in series or in parallel if they have a different wattage and different resistance?
Resistance voltage in parallel arms is equal. To find the current on the resistors, the voltage on the resistors can be divided by the resistances to find the currents on the individual resistors. The ...
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Multiple Resistors for Rf in Op-Amp
Yes, if you are using the feedback equations you can consider the resistors in series to be the same resistance.
- 77.9k
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What is the equivalent resistor of different resistors in series or in parallel if they have a different wattage and different resistance?
First of all resistance.
When resistors are connected in series, their resistances sum up.
$$ R_S = R_1 + R_2 $$
When resistors are connected in parallel, their conductances (Reciprocal of resistane) ...
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Accepted
Measurement of resistance of the Earth
Yes. One can measure very large resistances in the TΩ range and above with suitable instruments, for example for insulator characterization. However, such materials usually do not have a constant ...
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Resistance effects on LED when connected to battery
The 'forward voltage' given in an LED datasheet is a nominal value at a stated current (e.g., 20mA).
However, the LED current will vary widely with the applied voltage. Diodes (including LEDs) have an ...
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Does this quesion have a solution?
It is solvable but you will have a lot of solutions possible. The total current flowing through the 2 resistor branches is fixed but the ratio of currents flowing through them is not constrained. For ...
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How does resistance limit the gain in a common emitter amplifier?
Here is my (short) derivation of the gain formula, which answers your question (applying Ohms rule and a simple signal voltage sum at the input):
Gain A=Vout/Vin=-icRc/(vbe+ie*Re1)....... (Note ...
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How does resistance limit the gain in a common emitter amplifier?
For a first level approximation for AC gain make these assumptions for a nearly perfect transistor:
The transistor has very high gain.
As an emitter follower, the gain is equal to 1.
\$i_e = i_c\$
\$...
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How does resistance limit the gain in a common emitter amplifier?
Preface -- The Quiescent State
Let's make one simplification, at first: thevenizing the base resistor divider pair as follows:
simulate this circuit – Schematic created using CircuitLab
You ...
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How does resistance limit the gain in a common emitter amplifier?
Think about Q1 having very high gain so you could neglect the base current .Think also that the output loading is very low ie say a standard high impedance scope probe .If you can for a moment ...
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How does lowering resistance lead to lower IR drop if the current will increase as a result?
In your current loop you have five elements:
Two CPU blocks, which I will call "loads", Z1 and Z2.
Two resistances, the ones whose values we control in this experiment, whose values I will ...
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How does lowering resistance lead to lower IR drop if the current will increase as a result?
Experiments
To explain this phenomenon, it is necessary to specify from which source the circuit is powered - voltage or current. So let's look at both cases.
To simplify the schematics, in the ...
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How does lowering resistance lead to lower IR drop if the current will increase as a result?
Often when referring to reducing resistance to reduce an IR voltage drop it relates to undesirable resistance in series with other components.
An example would be a high power device on a PCB assembly ...
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How does lowering resistance lead to lower IR drop if the current will increase as a result?
So, if the resistors are the only 2 components in your circuit (except the power source), then you will always have the total IR drop equal to the power source.
Example:
You have a 5V battery and 2 1k ...
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