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A heater coil is connected to a 240 V power supply. The current flowing through the coil is 2.5 A. What is the power consumed by the heater?
600 W
480 W
96 W
120 W
600 W
The power consumed by an electrical appliance is the product of the potential difference across it and the current flowing through it. Using the formula P=V├ЧI, multiplying 240┬аV by 2.5┬аA yields a power consumption of 600┬аW.
The power consumed by an electrical appliance is the product of the potential difference across it and the current flowing through it. Using the formula P=V├ЧI, multiplying 240┬аV by 2.5┬аA yields a power consumption of 600┬аW.
Think of water flowing through a pipe: voltage is the water pressure, current is the volume flow rate, and power is the total energy delivered per second by the system.
Remember 'PIE': P=I├ЧE (where E or V stands for voltage/potential difference).
P=V├ЧI тАФ Electric power in terms of voltage and current
P=I2R тАФ Power in terms of current and resistance
P=RV2тАЛ тАФ Power in terms of voltage and resistance
Electric power represents the rate at which electrical energy is transformed into other forms of energy, such as heat in a heater coil. When a voltage is applied, free electrons drift through the resistor, colliding with atoms and converting electrical potential energy into thermal energy via Joule heating.
The SI unit of electric power is the Watt (W), which equals one Joule per second (1┬аW=1┬аJ/s).
Power consumption increases linearly with both voltage and current in a direct resistive circuit.
Enables accurate sizing of fuses, wires, and circuit breakers for electrical safety.
Basic formulas assume ideal constant resistance, though practical heater coils change resistance slightly with high temperatures.
Calculating electrical loads for domestic and industrial heating elements
Determining electricity consumption and energy billing parameters
Option B (480 W), Option C (96 W), and Option D (120 W) result from incorrect arithmetic operations instead of multiplying voltage by current.
The relationship is derived directly from Ohm's Law combined with the definition of electrical work.
A is correct тАФ The power consumed by the heater is calculated using P=V├ЧI, giving 240┬аV├Ч2.5┬аA=600┬аW.
For competitive exams like RRBJE, master the interchangeable power formulas (P=VI, P=I2R, P=RV2тАЛ) to solve numerical problems quickly depending on which variables are given.
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