Electricity

Make a circuit as shown in the below figure by using a powerful battery, two plastic wires, one is small and the other big with two metallic ends open and a switch. Now hold the two ends of the big wire with hands. Stretch the wire and place a pivoted magnetic needle that can rotate freely just below it. The needle deflects as soon as your friend switches the circuit on. 

Switch off the circuit and observe it again.

Do you know any device which can be run by solar energy?

Write a note about the calculator which can be run without changing a 'cell' or 'battery'.

Where does the electricity come from a solar calculator?

Which energy runs a calculator? And where does it come from?

Make a circuit like a figure given below using a nichrome wire, some plastic wires with two open ends, two cells and a switch made by you, two nails, and a wooden slab. Feel the temperature of the nichrome wire by touching it with your hand. Now put the switch on. Allow this condition to prevail for $10$-$11$ Seconds. Touch the wire again and feel the temperature.

Was the rise in temperature due to a flow of electricity through the wire?

Make a circuit like a figure given below using a nichrome wire, some plastic wires with two open ends, two cells and a switch made by you, two nails, and a wooden slab. Feel the temperature of the nichrome wire by touching it with your hand. Now put the switch on. Allow this condition to prevail for $10$-$11$ Seconds. Touch the wire again and feel the temperature.

Make a circuit like a figure given below using a nichrome wire, some plastic wires with two open ends, two cells and a switch made by you, two nails, and a wooden slab. Feel the temperature of the nichrome wire by touching it with your hand. Now put the switch on. Allow this condition to prevail for $10$-$11$ Seconds. Touch the wire again and feel the temperature.

Did the electricity pass through the nichrome wire in the first case?

Make a circuit like a figure given below using a nichrome wire, some plastic wires with two open ends, two cells and a switch made by you, two nails, and a wooden slab. Feel the temperature of the nichrome wire by touching it with your hand. Now put the switch on. Allow this condition to prevail for $10$ - $11$ seconds. Touch the wire again and feel the temperature.

Why is the temperature of the nichrome wire higher in the second case?

What is the reason for the brighter glow of light in LED?

Prepare a circuit like a figure given below using an LED, a cell, some wires having open ends and a switch made by you. The LED glows when the switch on and does not glow when the switch is off.

Is it the flow of electricity that causes the illumination of the LED?

Prepare a circuit like the figure given below using an LED, a cell, some wires having open ends and a switch made by you.

Why is the LED not glowing when the switch is off?

Prepare a circuit like the figure given below using an LED, a cell, some wires having open ends and a switch made by you. Now put the switch on.

What do you see? What is the source of energy that generates the glow in LED?

Set up the circuit shown below using a cell, big iron nails, some small nails, a hand-made switchboard and four insulated wires. Put the switch on and hold small nails nearer to the big nails. The big nail attracts the smaller nails when the switch on, but there is no attraction when the switch is off.

Is the electric current that converts that nail into a magnet?

Set up the circuit shown below using a cell, big iron nails, some small nails, a hand-made switchboard and four insulated wires. Put the switch off and hold small nails nearer to the big nails.

Does the big nail attract the smaller nails?

Set up the circuit shown below using a cell, big iron nails, some small nails, a hand-made switchboard and four insulated wires. Put the switch on and hold small nails nearer to the big nails.

What do you observe? Why does the big nail attract the small ones?

Make a circuit as shown in the below figure by using a powerful battery, two plastic wires, one is small and the other big with two metallic ends open and a switch. Now hold the two ends of the big wire with hands. Stretch the wire and place a pivoted magnetic needle that can rotate freely just below it.

The needle deflects as soon as your friend switches the circuit on. There is no magnet nearby. Then who applied force on the magnet?

Make a circuit as shown in the below figure by using a powerful battery, two plastic wires, one is small and the other big with two metallic ends open and a switch. Now hold the two ends of the big wire with hands. Stretch the wire and place a pivoted magnetic needle that can rotate freely just below it.

The needle deflects as soon as your friend switches the circuit on. Why?

Complete the below-given table.

Set one bulb, three wires and a cell as shown in the figure given below to make a complete circuit. The safety pin is touched with the first pin by rotating it. Will the bulb glow?