हिंदी

Write Joule's law of heating.

Advertisements
Advertisements

प्रश्न

Write Joule's law of heating.

 State and explain Joule's law of heating.

संक्षेप में उत्तर
Advertisements

उत्तर

Joule's law of heating: When a current (I) flows through a resistor of resistance (R) for time (t), then the amount of heat produced (H) is given by 

H = I2Rt

This is known as Joule’s law of heating.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 4: Electricity - Exercise 8

वीडियो ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्न

Why does the cord of an electric heater not glow while the heating element does?


The safety device based on the heating effect of electric current is called a ______.


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?


What is nichrome? State its one use.


How does the wire in the filament of a light bulb behave differently to the other wires in the circuit when the current flows?

What property of the filament wire accounts for this difference?


Which electric heating device in your home do you think have resistors which control the flow of electricity?


Give a scientific reason.

Tungsten metal is used to make a solenoid type coil in an electric bulb.


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.


Find the odd one out and give its explanation.


What is used to turn off the sudden increase in current in the electrical circuit of the house nowadays?


When does overloading occur?


An electric iron draws a current of 4 A when connected to 220 V mains. Its resistance must be:


Which of the following gases are filled in electric bulbs?


Can we use the same fuse in a geyser and a television set? Explain.


The following is not a safety device.


Two students decided to investigate the effect of water and air on iron object under identical experimental conditions. They measured the mass of each object before placing it partially immersed in 10 ml of water. After a few days, the object were removed, dried and their masses were measured. The table shows their results.

Student Object Mass of Object
before Rusting in g
Mass of the coated
object in g
A Nail 3.0 3.15
B Thin plate 6.0 6.33

What might be the reason for the varied observations of the two students?


What is the heating effect of electric current?


When a current I flows through a wire of resistance R for time t then the electrical energy produced is given by ______.


An electric iron of resistance 20 Ω draws a current of 5 A. The heat developed in the iron in 30 seconds is ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×