Question

If the power rating of a tubelight is 40 watts, calculate the rate at which the tubelight is consuming electricity in Joules per second (J/s).

• A. 80 J/s
• B. 40 J/s
• C. 220 J/s
• D. $40\times {10}^3$ J/s

Answer 1

The correct option is B 40 J/s

Given:
Power rating of tubelight = 40 watts
Since 1 Joule per second = 1 watt
Rate of consumption of electricity in J/s = $40\times 1$ = 40 J/s.
Therefore the 40 watts tubelight is consuming electricity at the rate of 40 Joules per second.