Question

A bulb rated 60w 120V is connected
to sov
80V mains. What is the current
through the bulb.​

Answer 1

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Answer 2

Concept:

• Power
• Current
• Voltage
• Electric circuits

Given:

• Power of bulb P = 60 W
• Voltage of bulb V = 120 V
• Voltage of mains Vm = 80 V

Find:

• The current through the bulb

Solution:

First, we need to determine the resistance of the bulb.

We know that Power P = V^2/R

P = 60 W, V = 120 V

P = V^2/R

R = V^2/P

R = 120*120/60

R = 240 ohm

We know from ohm's law that V = IR

I = V/R

Here, we use the voltage of mains

V = 80 V, R = 240 ohm

I = 80/240 = 1/3 = 0.33 A

The current through the bulb is 0.33 A.

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