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If a wire carries a current of 3 A and has a resistance of 2 ohms, what is the p

Practice Questions

Q1
If a wire carries a current of 3 A and has a resistance of 2 ohms, what is the power dissipated in the wire?
  1. 6 W
  2. 9 W
  3. 12 W
  4. 15 W

Questions & Step-by-Step Solutions

If a wire carries a current of 3 A and has a resistance of 2 ohms, what is the power dissipated in the wire?
  • Step 1: Identify the current (I) in the wire, which is given as 3 A.
  • Step 2: Identify the resistance (R) of the wire, which is given as 2 ohms.
  • Step 3: Use the formula for power (P), which is P = I^2 * R.
  • Step 4: Substitute the values into the formula: P = (3 A)^2 * 2 Ω.
  • Step 5: Calculate (3 A)^2, which is 9.
  • Step 6: Multiply 9 by 2 Ω to find the power: 9 * 2 = 18 W.
  • Step 7: Conclude that the power dissipated in the wire is 18 watts.
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