This document discusses electrical power and energy. It defines electrical power as work done per unit time (P=W/t) and gives the formulas for power as P=VI and P=I^2R. It defines 1 watt as 1 amp of current flowing through a circuit at 1 volt. It also defines the kilowatt-hour (kWh) as the energy consumed by a 1 kilowatt device over 1 hour, which equals 36,000 joules or 1 unit. Some numerical examples are provided to calculate power using the given formulas and units. Electrical energy is defined as power multiplied by time using the formulas E=P*t, E=VIt, and E=V^2/R

1. THE
ELECTRICAL
POWER
CLASS 10
Quantum SOLUTIONS

2. 1
IN CLASS 9
Electric POWER is defined as Work Done per unit Time
P= W/ t
In Electricity Electric Power = Work / time
As V= W/ q , So W = V X
q
Electric Power = V x q
t
As I = q/ t Electric Power = V x I
P = V I
Quantum SOLUTIONS

3. 2
MINDSET KICKSTARTER
Quantum SOLUTIONS

4. 3
ELECTRIC POWER
Quantum SOLUTIONS

5. 3
ELECTRIC POWER
Quantum SOLUTIONS
746 WATTS
1 HORSE POWER

6. 4
DEFINE 1 WATT?
Quantum SOLUTIONS
The power of an electrical appliance is said to
be 1 watt if 1 amp of current flow through it
when connected to 1 volt of potential diff.
P = VI

7. 5
ANOTHER FORMULE OF ELECTRIC POWER
AS I = V/R
AS V=IR
P= V2/R
ELECTRIC
POWER
P = V I
P= I2R
Quantum SOLUTIONS

8. 6
NUMERICALS
WRITE GIVEN
CALCULATE
SELECT FORMULA
Quantum SOLUTIONS
CHECK SI UNITS

9. 7
www.yourcompany.com
NUMERICAL 1
NO??
YES??
If the current and voltage of an electric circuit are given as
2.5A and 10V respectively. Calculate the electrical power?
PROBLEM
SOLVING Confusions?
Quantum SOLUTIONS
GIVEN
I = 2.5A
V = 10V
THE FORMULA FOR ELECTRIC POWER IS,
P = VI
P = 10 × 2.5 = 25WATTS

10. 7
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NUMERICAL 2
NO??
YES??
Calculate the power of an electrical circuit consisting of
resistance 3Ω and a current 4A flowing through this circuit?
PROBLEM
SOLVING Confusions?
Quantum SOLUTIONS
GIVEN
I = 4A
R = 3Ω
ELECTRIC POWER FORMULA IS,
P = I2R
P = 42×3
P = 16×3 = 48 WATTS

11. THE
ELECTRICAL
ENERGY
CLASS 10
Quantum SOLUTIONS

12. 9
ELECTRICAL ENERGY
Quantum SOLUTIONS
AS
POWER = WORK / TIME
OR
POWER = ENERGY / TIME
THEREFORE
ENERGY = POWER X TIME

13. 5
AS E = POWER X TIME
E= I2R T
P= V2/R
ELECTRIC
ENERGY
P = V I
P= I2R
Quantum SOLUTIONS
E= VIT
E= (V2 /R)T

14. 3
ELECTRIC ENERGY
Quantum SOLUTIONS
JOULE

15. 3
ELECTRIC ENERGY
Quantum SOLUTIONS
KILOWATT-HOUR (KW-H)
COMMERCIALUNIT

16. 4
DEFINE 1 KILOWATT-HOUR (KW-H)?
Quantum SOLUTIONS
The energy consumed by a device of POWER
rating 1 kilowatt when used for 1 HOUR, is
known as 1 Kilowatt-hour.
E = P X T
1 KW-H = 36,00,000 JOULES
1 KW-H = 1 UNIT

17. DEFINE COMMERCIAL UNIT OF ELECTRICAL ENER
OR
DEFINE 1 KW-H.
THE AMOUNT OF ENERGY USED BY AN ELECTRICAL APPLIANCE OF
POWER RATING 1KW, WHEN USED FOR 1HOUR, IS KNOWN AS 1 KW-HR.
12345675
Gyser
12345685

18. 4
ENERGY UNITS
Quantum SOLUTIONS
1 KW-H = 36,00,000 JOULES
1 CALORIE = 4.2 JOULES

19. 3
ELECTRIC ENERGY
Quantum SOLUTIONS
A POWER STATION OF MEGAWATT OF CAPACITY WILL
PRODUCE ELECTRICITY THAT EQUATES TO ABOUT THE SAME
AMOUNT OF ELECTRICITY CONSUMED BY 400 TO 900 HOMES IN A
YEAR.
MEGAWATT
1 MW = 1000 WATTS

20. THANK YOU
PRESENTED BY
PARAMJIT SINGH