Question

If NEPA charges 5k per kWh, what is the cost of

operating for 24 hours a lamp requiring 1A on a
200V line? A. 24K B. 55K C. 40K D. 26K
E. 32K.

Answer 1

The cost of operating a lamp that requires 1A on a 200V line for 24 hours at a NEPA charge of 5k per kWh is 24k, which is option A.

Step-by-step explanation:

First, let's calculate the power (in watts) used by the lamp by using the formula P = I × V, where P is power in watts, I is current in amperes, and V is voltage in volts. Given that the lamp requires 1A on a 200V line, the power it uses is 1A × 200V = 200W, or 0.2kW. Now, we need to determine the energy consumed by operating this lamp for 24 hours, which is obtained by the power (in kW) times the number of hours. So, the energy consumption is 0.2kW × 24h = 4.8kWh.

Next, we use the NEPA charge rate of 5k per kWh to calculate the cost. Multiplying the energy consumed by the rate gives us 4.8kWh × 5k per kWh which equals 24k. Therefore, the answer is 24k, which corresponds to option A.