09: Electrical Power And Household Circuits : Icse-x-physics

Change Unit Change Subject Last Menu

ICSE-X-Physics

09: Electrical Power and Household Circuits

with Solutions -

Note: Please signup/signin free to get personalized experience.

Note: Please signup/signin free to get personalized experience.

10 minutes can boost your percentage by 10%

Note: Please signup/signin free to get personalized experience.

#
Exercise 9 A

#
Section : A

Qstn #1
Write an expression for the electrical energy spent in flow of current through an electrical appliance in terms of current, resistance and time.
Ans : 1 Electrical energy, W = I²Rt joule

Qstn #2
Write an expression for the electrical power spent in flow of current through a conductor in terms of
Ans : 2

#2-a
Resistance and potential difference,
Ans : Electrical power, P = V²/R

#2-b
current and resistance.
Ans : Electrical power, P = I²R

Qstn #3
Electrical power p is given by the expression P = (Q × V) ÷ time
Ans : 3

#3-a
What do the symbols Q and V represent?
Ans : Q represents Charge and V represents Voltage.

#3-b
Express the power P in terms of current and resistance explaining the meaning of symbols used therein.
Ans : Electrical Power, P = I²R
Where I : current
And R : Resistance

Qstn #4
Name the S.I. unit of electrical energy. How is it related to Wh?
Ans : 4 The S.I. unit of electrical energy is joule.
1Wh = 3600 J

Qstn #5
Name the S.I unit of electrical energy. How is it related to Wh?
Ans : 5 The power of an appliance is 100 W. It means that 100 J of electrical energy is consumed by the appliance in 1 second.

Qstn #6
State the S.I. unit of electrical power.
Ans : 6
The S.I. unit of electrical power is Watt.

Qstn #7
(i) State and define the household unit of electricity. (ii) What is the voltage of the electricity that is generally supplied to a house?
Ans : 7 (i) The household unit of electricity is kilowatt-hour (kWh).
One kilowatt-hour (kWh) is the electrical energy consumed by an electrical appliance of
power 1 kW when it is used for one hour.
(ii) The voltage of the electricity that is generally supplied to a house is 220 Volt.

Qstn #8
Name the physical quality which is measured in (i) Kw (ii) kWh
Ans : 8 (i) Electrical power is measured in kW and
(ii) Electrical energy is measured in kWh.

Qstn #9
Define the term kilowatt-hour and state its value in S.I unit
Ans : 9 One kilowatt-hour (kWh) is the electrical energy consumed by an electrical appliance of power 1 kW when it is used for one hour.
Its value in SI unit is 1kWh = 3.6 × 10⁶ J