i. Calculate the resistance of an electric bulb which allows a 10A current when connected to a 220 V power source.
ii. Draw a schematic diagram of an resistance of an electric circuit consisting of a battery of two cells each of 1.5 V, 5 Ω, 10Ω and 15Ω resistors and a plug key, all connected in series.

Question

Philoid · Accepted Answer

i. Given :

The current in the bulb = 10A,

The applied voltage = 220 V,

Calculations:

By Ohm’s law, we have v = iR where v is the applied voltage across the resistance R, flowing current through it is i amperes.

Substituting the values, we get

220 = 10 × R,

R = 22 Ω

So, the resistance of the bulb is 22 Ω

ii. The circuit diagram is,