A washing machine is marked 240 V, 3 kW. What does this mean? Hence calculate the electrical energy used up…

Question

A washing machine is marked 240 V, 3 kW. What does this mean? Hence calculate the electrical energy used up by this machine in 1 hour.

ScanSolve AI Tutor · Accepted Answer

Here is the solution to the physics question:

1. A washing machine is marked 240 V, 3 kW. What does this mean? Hence calculate the electrical energy used up by this machine in 1 hour.

Meaning of the markings:
- 240 V: This indicates the rated voltage or operating voltage of the washing machine. It means the machine is designed to operate safely and efficiently when connected to a 240-volt electrical supply.
- 3 kW: This indicates the rated power of the washing machine. It means the machine consumes electrical energy at a rate of 3 kilowatts when it is operating at its normal capacity under the rated voltage.
Calculation of electrical energy used:

Identify the given values.
The power of the washing machine is $P = 3 \text{ kW}$ .
The time for which the machine operates is $t = 1 \text{ hour}$ .
Use the formula for electrical energy.
Electrical energy ( $E$ ) is calculated as the product of power ( $P$ ) and time ( $t$ ).
$E = P \times t$
Substitute the values into the formula and calculate.
$E = 3 \text{ kW} \times 1 \text{ hour}$ $E = 3 \text{ kWh}$
The electrical energy used up by this machine in 1 hour is $\boxed{\text{3 kWh}}$ .

A washing machine is marked 240 V, 3 kW. What does this mean? Hence calculate the electrical energy used up by this machine in 1 hour.