Question

An electric bulb draws a current of .8 A and works on 250 V on the average 8 hours a day.

a) Find the power consumed by the bulb
b) If the electric distribution company changes Rs 5 for 6 KWH, what is the monthly bill for 60 days​

Answer 1

Part A

To find the power consumed by the electric bulb, we can use the formula:

Power (P) = Voltage (V) × Current (I)

Given the voltage (V) is 250 V and the current (I) is 0.8 A, we can calculate the power as follows:

• P = 250 V × 0.8 A

• P = 200 W

So, the power consumed by the electric bulb is 200 Watts.

Part B

To calculate the monthly bill for 60 days, we need to find the energy consumption in kilowatt-hours (kWh). The bulb is used for 8 hours a day, so the total energy consumption can be calculated as:

Energy (E) = Power (P) × Time (t)

• E = 200 W × (8 hours/day × 60 days)

• E = 200 W × 480 hours

• E = 96,000 watt-hours

Now, convert watt-hours to kilowatt-hours:

• 96,000 watt-hours ÷ 1,000 = 96 kWh

The electric distribution company charges Rs 5 for 6 kWh. To find the cost for 96 kWh, you can use the proportion:

• Cost (C) = (Rs 5 ÷ 6 kWh) × 96 kWh

• C = (5 ÷ 6) × 96

• C = Rs 80

So, the monthly bill for 60 days is Rs 80.

________________________________________________________