NCERT Solutions for Class 7 Clat Chapter 14 Electric Current And Its Effects

Draw in your notebook the symbols to represent the following components of electrical circuits: connecting wires, switch in the ‘OFF’ position, bulb, cell, switch in the ‘ON’ position, and battery.

Draw the circuit diagram to represent the circuit shown infigure.

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

The bulb in the circuit shown in Figure does not glow. Can you identify the problem? Make necessary changes in the circuit to make the bulb glow.

Name any two effects of electric current.

When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.

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

Fill in the blanks:

(a) Longer line in the symbol for cell representsits_________terminal.

(b) The combination of two or more cells is called a _________.

(c) When current is switched ‘on’ in a room heater, it __________.

(d) The safety device based on the heating effect of electric current is called a _________.

Mark ‘T’ if the statement is true and ‘F’ if it is false:

(a) To make a battery of two cells, the negative terminal of one cell is connected to the negative terminal of the other cell. (T/F)

(b) When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks. (T/F)

(c) An electromagnet does not attract a piece of iron. (T/F)

(d) An electric bell has an electromagnet. (T/F)

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