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An electric fan is connected to a 220 V generator. The current is 0.50 A. What is the power used by the fan?
110 Watt
11 Watt
440 Watt
220 Watt
110 Watt
Electric power is defined as the rate at which electrical energy is transferred or converted by an electric circuit. For a given voltage and current, power is calculated by multiplying these two values together.
Electric power is defined as the rate at which electrical energy is transferred or converted by an electric circuit. For a given voltage and current, power is calculated by multiplying these two values together.
Think of voltage as the water pressure in a pipe and current as the flow rate of water; power is the total energy or 'strength' of the water jet hitting a water wheel.
P=V├ЧI тАФ Power (Watts) = Voltage (Volts) ├Ч Current (Amperes)
In an electric circuit, power (P) is the product of the potential difference (V) and the electric current (I). This is derived from the definition that power is the work done per unit time, where work done is energy (E=VIt), leading to the relation P=VI. In this scenario, a fan converts electrical energy into mechanical energy.
The SI unit of electric power is Watt (W).
One Watt is defined as the power consumed when 1 Ampere of current flows through a device connected to a potential difference of 1 Volt.
Power consumption remains constant for a steady resistive load under a constant voltage source.
Simple relationship for DC circuits.
Easy to measure using Voltmeter and Ammeter.
Does not account for reactive power in AC circuits (Power factor = 1 is assumed here).
Rating household appliances (Fans, Bulbs, Heaters).
Calculating electricity billing (kWh).
Voltage: 220V, Current: 0.50A.
Calculation: 220├Ч0.5=110.
Option B (11 W) assumes decimal error. Option C (440 W) is 220/0.5. Option D (220 W) confuses voltage with power.
A is correct тАФ The power is calculated as the product of voltage and current (P=220┬аV├Ч0.50┬аA=110┬аW).
Always ensure the units are in SI before calculating: Power must be in Watts, Voltage in Volts, and Current in Amperes.
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