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If a circuit has a current of 3A flowing through a 10Ω resistor, what is the pow

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Question: If a circuit has a current of 3A flowing through a 10Ω resistor, what is the power dissipated by the resistor?

Options:

  1. 30W
  2. 10W
  3. 90W
  4. 15W

Correct Answer: 30W

Solution: 

Power (P) = I^2 * R = 3^2 * 10 = 9 * 10 = 90W.

If a circuit has a current of 3A flowing through a 10Ω resistor, what is the pow

Practice Questions

Q1
If a circuit has a current of 3A flowing through a 10Ω resistor, what is the power dissipated by the resistor?
  1. 30W
  2. 10W
  3. 90W
  4. 15W

Questions & Step-by-Step Solutions

If a circuit has a current of 3A flowing through a 10Ω resistor, what is the power dissipated by the resistor?
  • Step 1: Identify the current (I) flowing through the resistor. In this case, I = 3A.
  • Step 2: Identify the resistance (R) of the resistor. Here, R = 10Ω.
  • Step 3: Use the formula for power (P) dissipated by a resistor, which is P = I^2 * R.
  • Step 4: Calculate I^2. Since I = 3A, I^2 = 3 * 3 = 9.
  • Step 5: Multiply I^2 by R to find the power. So, P = 9 * 10 = 90W.
  • Ohm's Law and Power Calculation – Understanding the relationship between current, resistance, and power in electrical circuits.
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