This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.
ScanSolve AI 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: Step 1: Identify the given values. The power of the washing machine is P = 3 kW. The time for which the machine operates is t = 1 hour. Step 2: Use the formula for electrical energy. Electrical energy (E) is calculated as the product of power (P) and time (t). E = P × t Step 3: Substitute the values into the formula and calculate. E = 3 kW × 1 hour E = 3 kWh The electrical energy used up by this machine in 1 hour is 3 kWh.