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The power dissipated by a circuit with a voltage of 12V and a current of 3A is 36W. Watts is Volts times Amps.

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Q: Determine the power dissipated if the voltage supplied to a circuit is 12V and the current measured is 3A?
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How is a parallel circuit the same as a series circuit?

In both cases, the power dissipated is measured by multiplying the voltage across the circuit by the current through the circuit.


Is a series circuit the same as a parallel circuit?

In both cases, the power dissipated is measured by multiplying the voltage across the circuit by the current through the circuit.


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How do you measure current without an amp meter?

Depends on the current. Put a resistor in-line with the current, then measure the voltage across the resistor. V=RI. So, divide the measured voltage by resistor value. Be careful with the size of the resistor, as Power dissipated in a resistor is R*I^2 or V^2/2. So, a 1-Amp current into a 1 Ohm resistor will result in a 1Watt power dissipated in the resistor. If it's too small, it'll burn. Also, notice that if you do that, you haven't measured the current in the original circuit. You've measured the current when an extra resistor is installed in the original circuit, and that's different.