Question

If a light bulb's power rating is 75W, it means it consumesjoule of electric energy in 1 second of time

Answer 1

Electrical energy consumed, E = 1.95 × 10⁻⁵ kWh

Step-by-step explanation:

It is given that,

Power rating on the light bulb, P = 75 W

We need to find the electrical energy consumed by the bulb in 1 second of time i.e in 0.00026 hours.

`P=(energy\ consumed)/(time)`

Energy consumed, E = P × t

E = 75 W × 0.00026 h

E = 0.0195 W-h

Energy consumed is calculated in kilo watt hour. Since, 1 watt = 0.001 kW

So, E = 1.95 × 10⁻⁵ kWh

Hence, this is the required solution.