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What is the current required to light a 60 W incandescent bulb in a domestic supply of 240 V ?

This questions was previously asked in

2022 NDA -1 GAT

0.5 A

0.25 A

1.0 A

5.0 A

To determine the current required for a 60 W incandescent bulb using a 240 V domestic supply, we apply the formula:

\[ \text{Current (I)} = \frac{\text{Power (P)}}{\text{Voltage (V)}} \]

- Power (P) = 60 W,

- Voltage (V) = 240 V.

- Calculate Current (I):

- \( I = \frac{60}{240} \)

- \( I = 0.25 \, \text{A} \)

Option: 2 - 0.25 A

- This shows the current required is 0.25 A.

- Option 1 (0.5 A): Incorrect, higher than actual current.

- Option 3 (1.0 A): Incorrect, much higher than needed.

- Option 4 (5.0 A): Incorrect, significantly higher.