First slide

Electrical power

Question

Electric bulbs 50 W-100 V glowing at full power are to be used in parallel with battery 120 V, $10 Ω$ . Maximum number of bulbs that can be connected so that they glow in fulI power is

Moderate

A

2
B

8
C

4
D

6

Solution

When each bulb is glowing at fulI power,
Current from each bulb $= i^{'} = \frac{50}{100} = \frac{1}{2} A$
So main current, $= i = \frac{n}{2} ampere$
Also $E = V + ir \Rightarrow 120 = 100 + (\frac{n}{2}) \times 10 \Rightarrow n = 4$

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