Question

Find out the power if the current inside the circuit is .002mA and resistance is 200
ohm?

Answer 1

Given:

Current = I = 0.02 mA

Resistance = 200 Ω

To find:

Power = ?

Solution:

Firstly convert milliAmperes to Amperes. Then calculate power by using a formula.

Step 1: Conversion of mA to A

1 A = 1000 mA

→ 1 mA = 1/1000 A

→ 0.02 mA = 0.00002 A

Step 2: Power is given as P = Voltage × Current

Voltage can be written as ‘Current × Resistance' by Ohm's law.

So, the formula for calculating power would be:

Power = (Current)² × Resistance

→ Power = (0.00002)² × 200

→ Power = 0.00000008 Watts

→ Power = 8 × 10⁻⁸ Watts

∴ Power consumed by the appliance = 8 × 10⁻⁸ Watts