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Electric Energy And Power

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Question
ICSEENIPH12030170
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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.

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Question
ICSEENIPH12030261
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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,
space space space straight P subscript 1 over straight P subscript 2 space equals space R subscript 2 over R subscript 1 rightwards double arrow 25 over P subscript 2 space equals space 20 over 400 rightwards double arrow space P subscript 2 italic space italic equals italic space italic 500 italic space W
This is the heating power developed in R2.

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