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An electric heater is connected to a 240 V source. The current flowing through the heater is 2.5 A. What is the power consumed by the heater?
400 W
600 W
800 W
960 W
600 W
The power consumed by an electrical appliance is the rate at which electrical energy is dissipated or converted. It is calculated as the product of the potential difference (voltage) and the electric current flowing through the circuit.
The power consumed by an electrical appliance is the rate at which electrical energy is dissipated or converted. It is calculated as the product of the potential difference (voltage) and the electric current flowing through the circuit.
Think of voltage as water pressure and current as the flow rate of water in a pipe; multiplying them gives you the total work or power delivered by the system.
P=V├ЧI тАФ Electric power in terms of voltage and current
When a voltage of 240┬аV is applied across the heater, it drives a current of 2.5┬аA through its resistance element. According to the electrical power formula, multiplying the voltage by the current yields the total electrical power consumed by the device.
Electric power is measured in watts (W).
One watt is equivalent to one joule per second (1┬аW=1┬аJ/s).
Electric heaters and geysers
Domestic heating and cooking appliances
Option B is correct because 240┬аV├Ч2.5┬аA=600┬аW.
Other options result from incorrect arithmetic or formula misapplication.
B is correct тАФ The power consumed is 600┬аW, calculated using the product of voltage (240┬аV) and current (2.5┬аA).
Always verify the units in numerical problems; converting between watts and kilowatts (1┬аkW=1000┬аW) is a frequent trap in RRB CBT exams.
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