(c) A lamp is marked 15 V, 30 W. How many joule does it consume in one hour and what is
the current that passes through it?
Answers
Answered by
3
Answer:
2 joule f current passes through it
Answered by
9
Joule consumed in one hour and current that passes through it is :
• Given : Voltage = 15 V,
Power = 30 W = 30×10^-3 kW
• Energy = Power × Time
It is given in kilowatt per hour or watt per sec
• Energy is defined as the power consumed by all the appliances in one hour.
• Energy = 30×10^-3 kW × 1 hour = 0.03 J or kWH
• For current,
we know that, P = V^2 / R
where R = resistance
R = V^2 / P = 15×15 / 30 = 15/2 = 7.5 ohm
• Current, I = V / R = 15 / 7.5 = 2 A
Similar questions