Question

Bulb a 50w - 220v bulb b 100w - 220v, which bulb will get fused first

Answer 1

Given the power and voltage rating of the bulbs we can get the current rating of the bulbs.

The formula for getting power is given by :

P = VI

Where :

P = the power

V = the voltage

I = Current

Bulb a:

I = P/V

= 50/220 = 0.2273 A

Bulb b:

I = P/V

= 100/220 = 0.45455 A

Since the current rating of A is smaller than the current rating of B then A should be fused first.

This is is because larger currents can make the bulb blow.