Electricity

Question 1

What does a switch do?

Answer 1

The switch makes the conducting link between the cell and the bulb

Question 2

Major Components of an electric circuit

Answer 2

1. Electric bulb
2. Cell or a battery
3. Wire
4. Switch

Question 3

When current flows from positive to negative, it is known as ________.

Answer 3

Conventional current

Question 4

When current flows from negative to positive, it is known as _______.

Answer 4

Electronic current

Question 5

What is the relation between charge, time and current

Answer 5

I = Q/t

Question 6

What is I?

Answer 6

Electric current

Question 7

What is Q?

Answer 7

Electric charge

Question 8

What is t?

Answer 8

Time taken

Question 9

What is the SI unit of current?

Answer 9

Ampere (A)

Question 10

What is the SI unit of charge?

Answer 10

Coloumb (C)

Question 11

1 Coloumb is equal to how many electrons?

Answer 11

6 x 10^18 e

Question 12

1 Electron is equal to how many coloumbs?

Answer 12

1.6 x 10^-19 C

Question 13

Who discovered Ampere?

Answer 13

Andre-Marie Ampere, a French Scientist

Question 14

1 Milliampere is equal to?

Answer 14

10^-3 A

Question 15

1 Microampere is equal to?

Answer 15

10^-6 A

Question 16

Which instrument used to measure Electric current?

Answer 16

Ammeter

Question 17

What type of resistance does an Ammeter have?

Answer 17

Low Resistance

Question 18

How is Ammeter connected in a circuit?

Answer 18

In Series

Question 19

What are the types of circuit?

Answer 19

Series and Parallel

Question 20

The amount of electrical energy electrons have at any point is known as:

Answer 20

Potential

Question 21

What is p.d?

Answer 21

Potential Difference

Question 22

What is V?

Answer 22

Voltage

Question 23

Who discovered Voltage?

Answer 23

Alessandro Volta, an Italian physicist

Question 24

What is the relation between electric charge, no. of electrons and energy of each electron?

Answer 24

Q = ne

Question 25

What is the relation between voltage, work done and electric charge?

Answer 25

W = VQ

Question 26

What is the SI unit of Heat/Work Done?

Answer 26

Joule (J)

Question 27

What is the SI unit of Potential difference?

Answer 27

Volt (V)

Question 28

Which instrument is used to measure the potential difference in a circuit?

Answer 28

Voltmeter

Question 29

How must the voltmeter be connected in a circuit?

Answer 29

In Parallel

Question 30

What type of resistance must a voltmeter have?

Answer 30

Very High resistance

Question 31

Who discovered Ohm’s Law?

Answer 31

Georg Simon Ohm, a German physicist

Question 32

What is Ohm’s Law?

Answer 32

V = IR

Question 33

What is R?

Answer 33

Resistance

Question 34

V is proportional to?

Answer 34

I

Question 35

What is ac?

Answer 35

Alternating current

Question 36

What is dc?

Answer 36

Direct current

Question 37

What is rf?

Answer 37

Radio frequency

Question 38

What is the SI unit of Resistance?

Answer 38

Ohm (Ω)

Question 39

What is variable resistance?

Answer 39

A component used to regulate current without changing the voltage source.

Question 40

What is Rheostat?

Answer 40

Rheostat is a device often used to change the resistance in the circuit

Question 41

Electrical conductivity of substances in order

Answer 41

Conductor -> Resistor -> Poor conductor -> Insulator

Question 42

The resistance of a conductor depends on?

Answer 42

1. its length
2. its area of cross-section
3. the nature of its material