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A refrigerator operates at 110 V and draws a current of 2.5 A. What is the power consumption of the refrigerator?
275 W
250 W
300 W
225 W
275 W
The power consumption of an electrical appliance is the rate at which it consumes electrical energy, calculated as the product of the voltage and current. For this refrigerator, multiplying the voltage of 110┬аV by the current of 2.5┬аA results in a power consumption of 275┬аW.
The power consumption of an electrical appliance is the rate at which it consumes electrical energy, calculated as the product of the voltage and current. For this refrigerator, multiplying the voltage of 110┬аV by the current of 2.5┬аA results in a power consumption of 275┬аW.
Think of voltage as water pressure and current as the flow rate of water through a pipe. The total power delivered is a product of how hard the water is pushed and how much water flows.
P=V├ЧI тАФ Electrical power formula
P=I2R тАФ Power using current and resistance
P=RV2тАЛ тАФ Power using voltage and resistance
Electric power in a direct current or resistive alternating current circuit is governed by the relationship between potential difference and electric current. The fundamental equation defines power as the rate of doing electrical work, expressed as P=V├ЧI.
The SI unit of electric power is the Watt (W), equivalent to joules per second.
Power consumption increases linearly with both operating voltage and current.
Calculating electricity bills and appliance ratings
Sizing circuit breakers and fuses for home electrical safety
Option A is correct because 110┬аV├Ч2.5┬аA=275┬аW.
Options B, C, and D are incorrect arithmetic outputs derived from incorrect multiplication.
A is correct тАФ The power consumption is 275┬аW based on the product of voltage and current.
For railway and technical exams like RRB JE, memorize the three primary variations of the electric power formula to quickly adapt depending on whether resistance is given.
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