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Class-10 Goyal Electric Energy, Power and Household Circuits ICSE Physics Solutions Ch-9

Class-10 Goyal Brothers Electric Energy, Power and Household Circuits ICSE Physics Solutions Ch-9 . We Provide Step by Step Answer of Exercise, MCQs, Numerical Problem Questions of Exercise-1 & 2 Goyal Brothers Electric Energy, Power and Household Circuits ICSE Class-10 . Visit official Website CISCE  for detail information about ICSE Board Class-10 Physics.

Electric Energy, Power and Household Circuits Class-10 Goyal Brothers ICSE Physics Solutions Ch-9


-: Select Topics :-

Exercise-1

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 MCQ -1

Numerical Problem-1

Exercise-2

 MCQ -2


Exe-1 Class-10

Electric Energy, Power and Household Circuits Goyal Brothers ICSE Physics Solutions Ch-9

Page-150

Question 1.
(a) What do you understand by the term electric work ?
Answer:
Electric work : “Electric work is said to be done when an electric charge flows through a conductor, at some potential difference.”
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 10

(b) State and define SI unit of electric work.
Answer:
S.I. unit of electric work → Joule (J)
1J = 1 volt × 1 coulomb
1 Joule : “Is the amount of work done when a charge of one coulomb flows through a conductor at a pot. diff. of 1 volt.”

(c) Name two bigger units of electric work. How are they related to SI unit ?
Answer:
Two bigger units of electric work :

  1. Kilo – Joule (kJ) = 103 J
  2. Mega-joule (Mj) = 106 J

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Question 2.
Derive an expression for electric work connecting :

(a) Current, resistance and time
(b) Current, potential difference and time.
(c) Potential difference, resistance and time.

Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 11

Question 3.
State three factors which determine the quantity of heat produced in a conductor.
Answer:
Three factors which determine heat produced in a conductor :
Heat produced = Energy Work done
W=H=I2Rt
∴ Three factors are I — current
R — Resistance of conductor
t — time for which current flows.

Question 4.

(a) What do you understand by the term electric power ?
(b) State SI unit of electric power and define it
(c) Name two bigger units of electric power and their relation with SI unit.

Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 12

Question 5.
Derive an expression for electric power connecting :

(a) Current and resistance.
(b) Current and potential difference.
(c) Potential difference and resistance.

Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 12.1
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 13

Question 6.

(a) What do you understand by term electric energy ?
(b) Name and define the smallest commercial unit of electric energy.
(c) Name and define the standard commercial unit of electric energy.

Answer:
(a) Electric energy : E = P × t = VIt
“Electric energy is the product of power and time.” i.e. electric energy consumed by an electrical appliance is produced of ‘power rating’ and ‘time’ for which it is used.
(b) Unit of electric energy → Joule (J)
S.I. unit of electric work → Joule (J)
1J = 1 volt × 1 coulomb
1 Joule : “Is the amount of work done when a charge of one coulomb flows through a conductor at a pot. diff. of 1 volt.”
(c) Standard Commercial unit of Electric Energy : Kilo-watt-Hour 1 kwH : “Is the amount of electrical energy consumed when an electrical appliance having a power rating of 1 kilowatt is used for 1 hour.”

Question 7.
With respect to electricity, define :

  1. watt hour
  2. watt
  3. kilowatt
  4. kilowatt hour. Amongst the above units, which are the units of : (i) electric energy (ii) electric power.

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Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 13.1
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 14

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Question 8.
How many joules of energy is equal to one kilowatt hour?
Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 14.1

Question 9.
Distinguish between kilo-watt and kilowatt hour.
Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 14.2

Question 10.
How many kilowatt is equal to one hour power ?
Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 14.3


 Multiple Choice Questions-1

Electric Energy, Power and Household Circuits Class-10 Goyal Brothers  ICSE Physics Solutions

1. A bulb has a resistance of 20 Ω and the p.d across its terminals is V. If the bulb is usedfor t seconds then energy consumed by the bulb is :
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 15

Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 15.1

2. A current Iflows through a resistance R for the time ‘t’, the electric energy consumed by the resistance is :
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 15.2

Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 15.3

3. The unit for electric work in SI system :
(a) Joule
(b) watt
(c) watt second
(d) watt hour
Answer:
(a) Joule

4. An electric appliance has a rating of 1000 W – 200 V. The resistance of the element of electric appliance is :
(a) 200 Ω
(b) 400 Ω
(c) 40 Ω
(d) 4000 Ω
Answer:
(c) 40 Ω

5. Kilowatt hour is commercial unit of :
(a) power
(b) electric energy
(c) heat energy
(d) mechanical energy
Answer:
(b) electric energy

6. Kilowatt hour and kilowatt are :
(a) SI units of power and electric energy
(b) commercial units of power and electric energy
(c) SI units of-electric energy and power
(d) commercial units of electric energy and power
Answer:
(d) commercial units of electric energy and power


Numerical Problem on Electric Energy

Electric Energy, Power and Household Circuits Class-10 Goyal Brothers  ICSE Physics Solutions

Page-152

Practice Problems 1

Question 1.
Calculate the energy released by a heater, which draws a current of 5A at 220 V for 1 min.
Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 16

Question 2.
An electric device consumes 8640 J of energy in 30 min. while operating at 24 V. Calculate the current drawn by the device.
Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 16.1

Practice Problems 2

Question 1.
An ekctric kettle draws a current of4A for 2.5 min. if the resistance of its element is 100 Ω , calculate the electric energy drawn by kettle in kilojoules.
Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 16.2
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 17

Question 2.
A soldering iron draws an energy of 43200 J in 4 min, when the current flowing through its element is 6 A, calculate the resistance of its heating element.
Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 17.1

Practice Problems 3

Question 1.
Calculate the heat energy given out by the filament of an electric bulb in 20 s, when its resistance is 4 Ω and p.d. across its ends in 12 V.
Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 17.2

Question 2.
An electric device gives out 5760 J of heat energy in 1 min, when current flows through it at a p.d. of 24 V. Find the resistance of the device.
Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 17.3

Practice Problems 4

Question 1.
An electric heater draws a current of 3.5 A at a p.d. of 250 V. Calculate the power of 4 such heaters.
Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 17.4
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 18

Question 2.
An electric bulb is rated 500 W – 200 V. Calculate the magnitude of current.
Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 18.1

Question 3.
An electric heater of power 1000 W, draws a current of 5.0 A. Calculate the line voltage.
Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 18.2

Practice Problems 5

Question 1.
An electric heater has a resistance of 40 Ω and draws a current of 4 A. Calculate :

  1. its power
  2. p.d. at its ends

Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 18.3

Question 2.
An electric heater of power 900 W, has a resistance of 36 Ω Calculate the magnitude of current and the p.d. at its ends.
Answer:
A New Approach to ICSE Physics Part 2 Class 10 Solutions Electric Energy, Power & Household Circuits 18.4

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