# Electricity Class 10 Science Chapter 12 Practice Questions

Chapter 12 of Science Subject of Class 10 is “Electricity”. Practice Questions [ Extra Questions ] for Electricity Class 10 Science Chapter 12 are provided on this page.

Contents

## Class 10 Science Chapter 12 : Electricity

These questions covers the majority of topics of the Electricity class 10 science chapter 12 like – Electricity, Electric Current, Coulomb, Ampere, Direction of Flow of Current etc.

### Practice Question of Electricity Class 10 Science Chapter 12 (Extra Question Answer )

Ques. 1 : What is Electricity ?
Answer : It is a type / form of energy . Flow of electrons is called as Electricity.

Ques. 2 : Define Electric Current .
Answer : Rate of flow of charge through a conductor . Electric Current is denoted by Capital ” I “. The SI Unit of Electric Current is Ampere.

Ques. 3 : What is Coulomb ?
Answer : It is the SI Unit of Electric Charge. It is denoted by ‘C’.
I = Q/t = Coulomb / charge
Q = I.t

Ques. 4 : What is 1 Ampere ?
Answer : The current passing through a conductor is said to be 1 Ampere when a charge of 1 coulomb flows through it in 1 second. It is denoted by A . It is SI Unit of Electric Current.

Ques. 5 : Define Electric Current, Mathematically .
Answer : Mathematically electric current can be defined as
I =Q/t

Ques. 6 : What does 1C/1s represent ?
Answer : It represent that 1 Coulomb of charge is flowing in 1 second. It represent the rate of flow of charge.

Ques. 7 : How smaller are the units of Current ?
Answer : Milliampere and Microampere are related to an ampere.
1mA = 10-3 A
1μA = 10-6 A

Ques. 8 : What is the amount of charge in 1 electron ?
Answer : 1.6 * 10-19 C of charge is present in 1 electron

Ques. 9 : How many electrons carry 1 coulomb of charge ?
Answer : 6 * 1018 electrons carry 1 coulomb of charge.

Ques. 10 : What is the direction of flow of electron ?
Answer : The direction of flow of current is opposite to flow of electrons.

Ques. 11 : Name the instrument that is used for measuring Electric Current .
Answer : Ammeter is the instrument which is used to measure the electric current in an electric circuit.

Ques. 12 : How ammeter is connected in the circuit ?
Answer : Ammeter is connected in series in the circuit to measure the electric current in the circuit.

Ques. 13 : What is an Electric Circuit ?
Answer : A continuous and closed path of an electric current is called an Electric Circuit.

Ques. 14 : What is Resistance ?
Answer : Resistance is an opposition to the flow of an electric current to a substance . The SI Unit of Resistance is Ohm ( )

Ques. 15 : Draw the symbols of Various electric components
Answer : Various Electric Components are –

• Electric Cell
• A battery
• Plug key ( Open )
• Plug Key ( Closed )
• A Wire Joint
• Wire Crossing without joining
• An Electric Bulb
• A resistor
• Rheostat ( Variable Resistance )
• Ammeter
• Voltmeter
• Galvanometer

Ques. 16 : What is Potential Difference ?
Answer : The difference in electric potential between any two points in an electrical field is known as Potential Difference. It is the amount of work done in carrying a unipositive charge from a point at lower potential to a point at higher potential. It is denoted by ‘ V ‘ .
V = W/ Q
The SI unit of Potential Difference is Volts.

Ques. 17 : What is Ohm’s Law ?
Answer : According to Ohm’s Law , the amount of current passing through a conductor is directly proportional to the potential difference across its different points.
V proportional I
V = IR

Ques. 18 : What are the three factors on which resistance depend ?
Answer : Factors on which resistance depends are –

• Length of a Conductor
• Area of Cross section
• Nature of its material

Ques. 19 : What is Resistivity ?
Answer : Resistivity can be defined as the resistance of conductor having length equals to 1 cm and area of cross section equals to 1cm2.

Ques. 20 : What is the symbol of Resistivity ?
Answer : Symbol of Resistivity is Rho ( ρ ) .

Ques. 21 : Derive the relation between Resistance , length and area of cross section of a conductor ?
Answer : R proportional L
R proportional 1/A
R proportional L/A
R = ρ L /A.

Ques. 22 : What is the Heating effect of Electric Current ?
Answer : If the electric circuit is purely resistive, i.e. a configuration of resistors only connected to a battery, the source of energy continuously dissipated entirely , in the form of heat. It is known as Heating effect of Electric Current.

Ques. 23 : Name one source of electricity ?
Answer : Battery/ Cell is one of the source of electricity.

Ques. 24 : What are the two principle factor which determines the heat produced in a wire of a given material ?
Answer : The two principle factors which determines the heat produced in a wire of a given material are-

• Current
• Resistance

Ques. 25 : What property of electricity is used in heater ,etc.
Answer : Heating effect of electric current.

Ques. 26 : Define Electric Power .
Answer : Electric Power is the amount of work done by an electrical appliance in one second. It is also defined as the rate at which the electrical appliance consumes energy.
P = Work / Time = Energy Consumed / Time

Ques. 27 : What is the Unit of Power ?
Answer : The Unit of Power is ” Watt “

Ques. 28 : Name the bigger unit of Power .
Answer : Kilowatt ( kW).
1 kW = 1000 W

Ques. 29 : What is the commercial unit of electric energy ?
Answer : Commercial unit of electric energy is ” KWh “

Ques. 30 : How KWh is related to Joule ?
Answer : 1 KWh = 1000 watt* 60 *60 sec
= 1000 * 3600 watt sec
= 3.6 * 106 Joules

## Electricity FAQs

### Q. What is the direction of flow of current ?

Ans. The direction of flow of current is opposite to the flow of electrons.