Question

A water pump draws about 3.7A when connected to 220V. What is the cost (with electrical energy at 6.0 cents per kWh) of running the pump for 7.0h?

Answer 1

Step-by-step explanation:

To calculate the cost of running the pump for 7.0 hours, we need to determine the energy consumption in kilowatt-hours (kWh) and then multiply it by the cost per kWh.

Step 1: Calculate the power consumption in kilowatts (kW):

Power (P) = Voltage (V) * Current (I)

P = 220V * 3.7A = 814W (watts)

Step 2: Convert the power to kilowatts (kW):

Power in kW = 814W / 1000 = 0.814kW

Step 3: Calculate the energy consumption in kilowatt-hours (kWh):

Energy (E) = Power (P) * Time (t)

E = 0.814kW * 7.0h = 5.698kWh

Step 4: Calculate the cost:

Cost = Energy (E) * Cost per kWh

Cost = 5.698kWh * $0.06/kWh

Now, calculate the cost:

Cost = 0.34188 dollars

So, the cost of running the pump for 7.0 hours at 6.0 cents per kWh is approximately $0.34.