Question

An electric bulb is rated as 50W,220V.Calculate the energy consumed by the bulb in 20mins.Express your ans in commercial units of energy.......

Answer 1

P= 50/1000 kW

t= 20/60 s

Energy consumed = Pt

=50/1000 * 20.69

= 1/60

=0.016 kW

Answer 2

Answer:

Energy consumed, E = 0.0165 kWh

Explanation:

It is given that,

Power of the electric bulb, P = 50 W

Voltage of the bulb, V = 220 V

Time taken, t = 20 min = 0.33 hours

The power of an electrical appliance in commercial unit is calculated as :

$P=\dfrac{50}{1000}\ kW=0.05\ kW$

Let E is the energy consumed by the bulb in 20 minutes. It is calculated as the product of power consumed and time taken as :

$E=P\times t$

$E=0.05\ kW\times 0.33\ h$

E = 0.0165 kWh

So, the energy consumed by the bulb is 0.0165 kWh. Hence, this is the required solution.