An electric lamp consumes 60 watts at 220 volts. How many dry cells of EMF 1.5 volt and internal resistance 1 ohm are required t
o glow the lamp?
1 answer:
Answer:
179.3 cells
Explanation:
The lamp requires a current of 60W/220V = 0.273A
The dry cells each have an internal resistance of 1Ω.
The number of cells required in series equals 220V divided by the cell's voltage minus their internal voltage drop under a load current of 0.273A.
= 220V/(1.5V–1Ω*0.273A)
=179.3 cells
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