## Electricity

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*Worksheet*

*Worksheet*

**Fill in the blanks**

**1**. The source of all electricity is ______. It’s SI unit is _________.

**2**. The net charge flowing through a cross section of a conductor in unit time is called ________.

**3**. Electric potential difference between points in an electric circuit is the ______ _______ to move a unit charge from one point to other. i.e. 1V = ____/1C.

**4**. Current is measured in Amperes using _______.

**5**. If 90 coulombs charge passes through the conductor for 5 minutes, then the current in the conductor is _____.

**6**. A _________ is an electronic measuring instrument the combines several measuring functions (electric potential difference, electric current and electric resistance) in one unit.

**7**. SI unit of electric potential difference is _______.

**8**. When the cells of 1V , 1.5V, 2V, are connected in series then the resultant potential difference is _____.

**9**. When resistances (R1, R2, R3...) are connected in series, their equivalent resistance is equal to the of the individual resistances. i.e. R = __________

**10**. SI unit electric resistance is ________.

**11**. The resistance of a conductor is directly proportional to its _____.

**12**. The _________ of the material is the resistance per unit length of a unit cross section of the material.

**13**. Units of specific resistance _____.

**14**. When two resistances of 6 Ω and 12 Ω are connected in series then the effective resistance is _____.

**15**. When two resistances of 6 Ω and 12 Ω are connected in parallel then the effective resistance is _____.

**16**. A 1.5 V battery is connected such that a current of 0.15A flows through the circuit. Then the resistance of the conductor is ____________.

**17**. The effective resistance is less than any individual resistances when resistances are connected in _________.

**18**. Two or more resistors are said to be connected in _______ if same current flows through them.

**19**. The electric power is the product of __________ and the __________.

**20**. SI Unit of power is ___________.

**21**. The units of house hold consumption of electrical energy are _____.

Answers:

1: charge, coulomb (C)

2: current.

3: work done, 1J(1 Joule)

4: ammeter

5: 0.3A

6: multi-meter

7: volt (V)

8: 4.5 V

9: sum, R = R1 + R2 + R3 + ...

10: Ohm (Ω)

11: length

12: resistivity

13: Ohm-meter (Ωm)

14: 18 Ω

15: 4 Ω

16: 10 Ω

17: parallel

18: series

19: potential difference, current

20: watt (W)

21: Kilo Watt Hour (KWh)