Distinguish between an open circuit and a closed circuit.

Name two electric devices for each where
(a) heating effect of current is used and
(b) magnetic effect of current is used.

In the circuit shown in figure

(a) Would any of the bulb glow, when the switch is in the OFF position?
(b) What will be the order in which the bulbs A, B and C will glow, when the switch is moved to the ON position?

Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.

Will the compass needle show deflection, when the switch in the circuit shown by figure is closed?

Figure shows four cells fixed on a board. Draw lines to indicate how will you connect their terminals with wires to make a battery of four cells.

When does a circuit is said to be overloaded?

Briefly state the effects of electricity.

Briefly mention which part of the symbol of battery shows positive and negative terminals?

Name the type of mark for which we should look at an electrical appliance before buying.

Explain why are CFLs (Compact Fluorescent Lamps) preferred over electric bulbs.

State the property of a conducting wire is utilised in making electric fuse.

Last Sunday, Pulpit was playing videotape in his room. While playing, the electricity of his house went off due to which he could not able to see anything around him. Then anyhow, he managed to get his mobile in his hand and with the help of its light, he went outside of his room to check if there was any problem in the electric circuit board of his house.
At the same time, his father suggested him to maintain the distance from the circuit board and decided to call some electrician to check the problem.
(a) Explain, what happens when live wire and neutral wire touches each other directly?
(b) State the values here showed by Pulkit's father.

Paheli took a wire of length 10 cm. Boojho took a wire of 5 cm of the same material and thickness both of them connected with wires as shown in the circuit given in figure. The current flowing in both the circuits is the same.
(a) Will the heat produced in both the cases be equal? Explain.
(b) Will the heat produced be the same, if the wires taken by them are of equal lengths but of different thickness? Explain.

One day, Pinki was ironing the clothes in her room. After half an iron of ironing, the light went off and Pinki went outside to the lobby of her house to check it there was any problem in the household circuit. At the same time, she listened the voice of her 4 years old daughter from the same room where she was ironing the clothes. Her daughter was about to touch the hot electric iron but at the same moment, Pinki entered in the room and pushed her daughter back from that place.
(a) On which effect of electric current, does the electric iron works?
(b) Mention the values showed by Pinki here.

Which of the following precautions need not be taken while using electric gadgets/ appliances/circuit?

When an electric current flows through a copper wire AB as shown in figure, the wire

If the number of turns in the coil of an electromagnet is more, the strength of the electromagnet will be

Circuit breaker device which can be used in place of fuse in domestic electric wiring is called

Choose the statement which is not correct in the case of an electric fuse.