A lightbulb has an efficiency of 1.8% the amount of heat energy (not light energy) is generated by the bulb every second if the bulb has a power of 120 W would be 117.8 Joules, therefore the correct option is option C.
What is power?
The rate of doing work is known as power. The Si unit of power is the watt.
Power =work/time
The mathematical expression for the power is as follows
P = VI
where P is the power
V is the voltage
I is current passing through the circuit
As given in the problem a lightbulb has an efficiency of 1.8% which means when 100 watts are delivered to the bulb as electrical power only 1.8 watts are utilized as light energy and the rest of the power is wasted as the heat energy
Hence the heat utilized by the light bulb when 120 watts of power is provided is
=120*1.8/100
=2.16 Watts
The amount of power wasted as heat energy is
= 120-2.16
=117.8 Watts
Thus, the amount of heat energy (not light energy) generated by the bulb every second if the bulb has a power of 120 W would be 117.8 Joules, therefore the correct option is option C.
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