Question

An electric bulb of 100 Watt operates 10 hour a day. What is the cost of energy to operate it for one day at Rs. 6 per kWh?

1. Rs. 60
2. Rs. 600
3. Rs. 0.6
4. Rs. 6

Answer 1

The cost of energy to operate the 100 Watt electric bulb for one day is Rs. 6.

Step-by-step explanation:

To calculate the cost of energy to operate an electric bulb for one day, we need to find the energy consumed by the bulb and multiply it by the cost per kilowatt-hour (kWh).

The energy consumed by the bulb can be found using the formula: power (in kilowatt) multiplied by time (in hours). In this case, the power is 100 Watts, which is equivalent to 0.1 kilowatts, and the time is 10 hours.

So, the energy consumed by the bulb is 0.1 kW * 10 hours = 1 kWh.

Now, we can calculate the cost of energy using the formula: energy (in kWh) multiplied by cost per kWh. In this case, the energy is 1 kWh and the cost per kWh is Rs. 6.

So, the cost of energy to operate the bulb for one day is 1 kWh * Rs. 6/kWh = Rs. 6.