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Electric Energy And Power
Question
Three bulbs of specifications 60 W/220 V, 100 W/220 V and 1000 W/220 V are connected in series. Which one will glow the brightest ?
Solution
In series, Power, P = I2R.
The resistance of 60 W/220 V bulb will be greater than any other given bulbs.
Brightness depends upon the power consumed.
Question
Two resistors R1 = 400 ohm and R2 = 20 ohm are connected in parallel to a battery. If heating power developed in R1 is 25 W, find the heating power developed in R2.
Solution
Given,
Resistance, R1 = 400 ohm; Resistance, R2 = 20 ohm
Power in resistor R1, P1 = 25 W
Using the formula,
This is the heating power developed in R2.
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Mock Test Series
Mock Test Series