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An electric heater is connected to a 240 V supply. If the current flowing through it is 2.5 A, what is the power consumed by the heater?
600 W
500 W
480 W
96 W
600 W
The power consumed by an electrical appliance is the product of the potential difference (voltage) across it and the current flowing through it. Using the given values of V=240┬аV and I=2.5┬аA, the power is calculated as P=V├ЧI=240├Ч2.5=600┬аW.
The power consumed by an electrical appliance is the product of the potential difference (voltage) across it and the current flowing through it. Using the given values of V=240┬аV and I=2.5┬аA, the power is calculated as P=V├ЧI=240├Ч2.5=600┬аW.
Think of electrical power like a water hose: voltage is the water pressure, current is the amount of water flowing, and power is the total force at which the water hits the target.
Remember 'Piv' (P = IV) to quickly relate Power, Current, and Voltage.
P=V├ЧI тАФ Relation between Power, Voltage, and Current
P=I2R тАФ Power in terms of Current and Resistance
P=RV2тАЛ тАФ Power in terms of Voltage and Resistance
Electrical power is defined as the rate at which electrical energy is dissipated or consumed in a circuit. According to Joule's Law of heating and the definition of power in an electric circuit, P=VI. This formula assumes that all electrical energy is being converted into other forms, such as thermal energy in the case of a heater.
The SI unit of electric power is the Watt (W), equivalent to 1┬аJoule/second.
A supply of 240 V is the standard domestic voltage in many countries, including India.
Power consumption is directly proportional to both voltage and current.
Efficiency in calculating energy consumption for billing purposes.
Does not account for reactive power in AC circuits involving inductors or capacitors.
Rating electrical appliances like bulbs, heaters, and geysers.
Designing home electrical wiring and safety fuses.
The constant for calculation is P=600┬аW.
Option B (500 W) results from incorrect multiplication. Option C (480 W) is 240├Ч2. Option D (96 W) results from division instead of multiplication.
A is correct тАФ The electric power consumed by the heater is determined by the product of the supply voltage and the current, yielding 600┬аW.
Always ensure units are in SI (Volts and Amperes) before calculating power; if energy is required in kWh, remember to divide the total power in Watts by 1000 and multiply by time in hours.
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