Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
An electric bulb is connected to a 240 V source. The current flowing through the bulb is 0.75 A. What is the power consumed by the bulb?
180 W
120 W
320 W
240 W
180 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 0.75┬аA yields 180┬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 0.75┬аA yields 180┬аW.
Think of voltage as the water pressure in a pipe and current as the volume of water flowing per second; power is the total work done by the water flow.
P=V├ЧI тАФ Electric power formula using voltage and current
P=I2R тАФ Electric power formula using current and resistance
P=RV2тАЛ тАФ Electric power formula using voltage and resistance
Electric power represents the rate at which electrical energy is transformed or consumed by an electric circuit. When a voltage is applied across a load, it drives free electrons, and the product of this driving force (V) and the rate of flow (I) gives the total power dissipated.
The SI unit of electric power is the Watt (W), equivalent to Joules per second.
Power rating indicates how fast an appliance consumes electrical energy.
Sizing electrical wiring and fuses
Calculating electricity bills in kilowatt-hours (kWh)
Option B (120 W) is an incorrect calculation result.
Option D (240 W) would be the power if the current were 1┬аA.
A is correct тАФ The power consumed is calculated as P=240┬аV├Ч0.75┬аA=180┬аW.
Remember that 1┬аW=1┬аV├Ч1┬аA. Always convert your current to decimals if given in fractions to avoid calculation mistakes.
Get instant step-by-step AI explanations, full shift Previous Year Papers (SSC GD, RRB, SSC JE), and regional rank analysis on the official Examoogle App.
Free Download тАв 100K+ Aspirants