Advertisements
Advertisements
Question
Write the mathematical expression for Joule’s law of heating.
Advertisements
Solution
The mathematical expression of Joule’s Law of heating is: H = I2 Rt
Where,
H = Produced Heat
I = Current flowing through the device
t = Time taken
r = Resistance of the appliance
APPEARS IN
RELATED QUESTIONS
Write down the formula for the heat produced when a current I is passed through a resistor R for time t.
The current passing through an electric kettle has been doubled. The heat produced will become:
(a) half
(b) double
(c) four time
(d) one-fourth
An electric iron of 1100 W is operated for 2 hrs daily. What will be the electrical consumption expenses for that in the month of April? (The electric company charges Rs 5 per unit of energy).
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.
Rewrite the following statement by selecting the correct option:
1 A = ____________ mA.
A coil of an alloy _______ is used in electric heater cooker as a resistor.
What is used to turn off the sudden increase in current in the electrical circuit of the house nowadays?
Explain the application of heating effect of electric current in an electric bulb with a diagram.
Your teacher has shown you the following activity.
Activity: Teacher has wound a long insulated piece of wire around an iron nail in the form of a coil. Free ends of the wire are connected to a cell through a switch as shown in the following figure. The current is switched on and some pins are placed near the ends of the nail.
Write down any three questions that come to your mind about this activity.
What is a trip switch?
