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In an electric circuit, if the voltage is 12 V and the current is 3 A, what is t

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Question: In an electric circuit, if the voltage is 12 V and the current is 3 A, what is the power?

Options:

  1. 36 W
  2. 9 W
  3. 4 W
  4. 12 W

Correct Answer: 36 W

Solution: 

Power in an electric circuit is given by P = V * I. Here, P = 12 V * 3 A = 36 W.

In an electric circuit, if the voltage is 12 V and the current is 3 A, what is t

Practice Questions

Q1
In an electric circuit, if the voltage is 12 V and the current is 3 A, what is the power?
  1. 36 W
  2. 9 W
  3. 4 W
  4. 12 W

Questions & Step-by-Step Solutions

In an electric circuit, if the voltage is 12 V and the current is 3 A, what is the power?
Correct Answer: 36 W
  • Step 1: Identify the voltage in the circuit. In this case, the voltage (V) is 12 volts.
  • Step 2: Identify the current in the circuit. Here, the current (I) is 3 amperes.
  • Step 3: Use the formula for power in an electric circuit, which is P = V * I.
  • Step 4: Substitute the values into the formula: P = 12 V * 3 A.
  • Step 5: Calculate the power: 12 multiplied by 3 equals 36.
  • Step 6: Conclude that the power (P) is 36 watts.
  • Power Calculation – Understanding the relationship between voltage, current, and power in an electric circuit using the formula P = V * I.
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