Advertisements
Advertisements
Question
Write down the formula for the heat produced when a current I is passed through a resistor R for time t.
Solution
H = I2Rt where H is the heat energy produced, I is the current, R is the resistance and t is the time.
APPEARS IN
RELATED QUESTIONS
State four most common electrical appliances based on heating effect of electric current. Why do we use finely heated platinum wire in surgery?
An electric heater is connected to the 230 V mains supply. A current of 8 A flows through the heater.
(b) How much energy is transferred to the heater each second?
Name the factors on which the heat produced in a wire depends when current is passed in it, and state how does it depend on the factors stated by you.
A coil of an alloy _______ is used in electric heater cooker as a resistor.
Assertion: Bending of wire decreases the resistance of the electric wire.
Reason: The resistance of a conductor depends on length, thickness, nature of material and temperature of the conductor.
An electric fuse has a body made of ceramic and two points for connecting the fuse wire.
An electric fuse is a wire made up of a material having ______ melting point.
A trip switch is a ______ safety device.
In which of the following applications of Iron, rusting will occur most? Support your answer with valid reason.
| A | B | C | D |
 |
 |
 |
 |
When a current I flows through a wire of resistance R for time t then the electrical energy produced is given by ______.
