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# Electric Current and its Effects worksheet for class 7

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## Symmetry worksheet for class 7 Important Topics

• SYMBOLS OF ELECTRIC COMPONENTS
• HEATING EFFECT OF ELECTRIC CURRENT
• MAGNETIC EFFECT OF ELECTRIC CURRENT
• ELECTROMAGNET
• ELECTRIC BELL

## Some important Facts about Electric Current and its Effects worksheet for class 7

1. Set up the circuit shown in Fig. 14.17 again. Move the key to ‘ON’ position and watch carefully in which direction the compass needle gets deflected. Switch ‘OFF’ the current. Now keeping rest of the circuit intact, reverse the connections at the terminal of the cell. Again switch ‘on’ the current. Note the direction in which the needle gets deflected. Think of an explanation.
2. Make four electromagnets with 20, 40, 60 and 80 turns. Connect them one by one to a battery of 2 cells. Bring the electromagnet near a box of pins. Count the number of pins attracted by it. Compare the strengths of the electromagnets.

## NCERT class 7  Science Solved Worksheets

• Chapter-1 Nutrition in Plants
• Chapter-2 Nutrition in Animals
• Chapter-3 Fiber to Fabric
• Chapter-4 Heat
• Chapter-5 Acids, Bases and Salts
• Chapter-6 Physical and Chemical Changes
• Chapter-7 Weather, Climate And Adaptation
• Chapter-8 Wind Storms and Cyclones
• Chapter-9 Soil
• Chapter-10 Respiration in Organisms
• Chapter-11 Transportation in Animals and Plants
• Chapter-12 Reproduction in Plants
• Chapter-13 Motion and Time
• Chapter-14 Electric Current and its Effect
• Chapter-15 Light
• Chapter-16 Water A Precious Resource
• Chapter-17 Forests: Our Lifeline
• Chapter-18 Waste Water Story

## ELECTRIC BELL

We are quite familiar with an electric bell. It has an electromagnet in it. Let us see how it works. as an electromagnet. An iron strip with a hammer at one end is kept close to the electromagnet. There is a contact screw near the iron strip. When the iron strip is in contact with the screw, the current flows through the coil which becomes an electromagnet.pulls the iron strip. In the process, the hammer at the end of the strip strikes the gong of the bell to produce a sound. However, when the electromagnet pulls the iron strip, it also breaks the circuit. The current through the coil stops flowing

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