Advertisements
Advertisements
Question
How does the heat produced by die passage of current in a metallic wire depend on the current in the wire?
Advertisements
Solution
The heat produced is proportional to the square of current passed in the wire.
RELATED QUESTIONS
A bulb is rated as 250 V; 0.4 A. Find its : (i) power, and (ii) resistance.
What is the energy conversion when an electric current passes through a metallic wire?
What is ‘Rating’ of an electric appliance?
State relative advantages and disadvantages of ring system of wiring over the tree system.
I ampere of current is passed through a resistor of resistance R ohm for time t second. Obtain expression for
(i) the electrical energy, and
(ii) the electrical power spent.
A family uses a light bulb of 100W, a fan of 100W, and a heater of 1000W, each for 8 hours a day. If the cost of electricity is Rs. 2 per unit, what is the expenditure to the family per day, on electricity?
A battery of e.m.f. 12V and internal resistance 1.6 Ω is connected to two resistors of 4Ω and 6Ω connected in parallel. Calculate:
(i) the current drawn from the battery,
(ii) the power dissipated in each resistor,
(ii)the total power supplied by the battery.
A torch bulb is rated at 3 V and 600 mA. Calculate it’s
- power
- resistance
- energy consumed if it is used for 4 hours.
