Fill in the blanks:
$(i)$. Our body is a ________ of electricity.
$(ii)$. An electric cell produces electricity from the ________ in it.
$(iii)$. In an electric circuit a fuse is a ________ to prevent possible fire.
$(iv)$. A combination of two or more cells is called a ________.
$(i)$. Our body is a conductor of electricity.
$(ii)$. An electric cell produces electricity from the chemicals stored in it.
$(iii)$. In an electric circuit, a fuse is a safety device to prevent a possible fire.
$(iv)$. A combination of two or more cells is called a battery.
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- Fill in the blanks:1. Our body is a ………………….. of electricity. 2. An electric cell produces electricity from the ………………….. in it. 3. In an electric circuit a fuse is a ………………….. to prevent possible fire. 4. A combination of two or more cells is called a ………………….. . 5. The coil of wire in an electric heater is called an ………………….. . 6. A ………………….. is a safety device which prevents damages to electrical circuits and possible fires. 7. The wire gets ………………….. when an electric current passes through it. 8. We must look for ………………….. mark on electrical appliances. 9. When electric current passes through a wire, it behaves like a magnet. It is the ………………….. effect of current. 10. Crane has a strong ………………….. attached to it.
- Fill in the blanks :$(a)$. A device that is used to break an electric circuit is called _______________.$(b)$. An electric cell has _______________
- Fill in the blanks :$(a)$. A device that is used to break an electric circuit is called ___________.$(b)$. An electric cell has _______________ terminals.
- Fill in the blanks 1. A device that is used to break an electric circuit is called __________2. An electric cell has _______ terminals
- What is the usual capacity of an electric fuse used (i) in the lighting circuit, and (ii) in the power circuit, of a small house?
- Fill in the blanks:$(a)$. Longer line in the symbol for a cell represents its______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_________.
- Draw the symbols of the following circuit components.$(i)$. electric cell$(ii)$. switch in off position$(iii)$. electric bulb$(iv)$. battery
- Explain the importance of using in a household electric circuit (i) fuse, and (ii) earthing wire.
- Give the symbol of an electric fuse used in circuit diagrams.
- (a) An electric iron is rated at 230 V, 750 W. Calculate (i) the maximum current, and (ii) the number of units of electricity it would use in 30 minutes.(b) Which of the following fuse ratings would be suitable for this electric iron? 1 A, 3 A, 5 A, 13 A
- What is the main difference in the wiring of an electric bulb and a socket for using an electric iron in a domestic electric circuit? What is the reason for this difference?
- Fill in the blanks.$(i)$. The object to be electroplated is taken as……….electrode.$(ii)$. One of the most common applications of chemical effect of electric current is……….$(iii)$. Small amount of a mineral salt present naturally in water makes it a………. of electricity.$(iv)$. Electroplating of………. is done on objects like water taps andcycle bell to give them a shiny appearance.
- (a) State Fleming’s Left-hand rule.(b) List three characteristic features of the electric current used in our homes.(c) What is a fuse? Why is it called a safety device?(d) Why is it necessary to earth metallic electric appliances?
- Fill in the blanks:(i) A tangent to a circle intersects it in ………… point(s).(ii) A line intersecting a circle in two points is called a ………….(iii) A circle can have parallel tangents at the most ………….(iv) The common point of a tangent to a circle and the circle is called ………...
- Choose the incorrect statement.$(a)$. A switch is the source of electric current in a circuit.$(b)$. A switch helps to complete or break the circuit.$(c)$. A switch helps us to use electricity as per our requirement.$(d)$. When the switch is open there is an air gap between its terminals.
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