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An electric bulb is connected to a 200┬аV generator. The current drawn by the bulb is 0.1┬аA. What is the power of the bulb?
10 W
20 W
2 W
200 W
20 W
The electric power (P) consumed by an appliance is calculated by the product of the voltage (V) applied across it and the current (I) flowing through it. Using the given values, P=200V├Ч0.1A=20W.
The electric power (P) consumed by an appliance is calculated by the product of the voltage (V) applied across it and the current (I) flowing through it. Using the given values, P=200V├Ч0.1A=20W.
Think of voltage as the water pressure in a pipe and current as the flow rate of water; power is the total 'work' or force generated by that water flow.
P=V├ЧI тАФ Power equals Voltage times Current
P=I2├ЧR тАФ Power in terms of Current and Resistance
According to the principle of electric power, the rate at which electrical energy is dissipated or consumed in an electric circuit is given by the product of potential difference and electric current. This relation is derived from P=VI, where V is in Volts and I is in Amperes, resulting in Power measured in Watts (W).
The SI unit of electric power is the Watt (W).
One Watt is equal to one Joule per second (1J/s).
Voltage (V) represents electrical potential difference, and Current (I) represents the rate of flow of charge.
Helps in determining energy consumption.
Ensures selection of appropriate electrical components.
Rating electrical appliances like bulbs, heaters, and motors.
Calculating household electricity bills based on kWh usage.
A Watt is a small unit; therefore, commercial electrical energy is often measured in kilowatt-hours (kWh).
Option B (20 W) is the correct result of 200├Ч0.1.
B is correct тАФ The power of the bulb is calculated as P=V├ЧI=200V├Ч0.1A=20W.
Always verify the units before multiplying; for example, if power is required in kW, divide the final result by 1000.
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