FORM 3 Topic 6.4 - Calculate the cost of electricity consumption

Topic 6.4

Calculate the cost of
electricity consumption

Energy actually used

Energy efficiency = X 100%


Energy supplied

Energy efficiency
= the percentage of energy input converted to useful
form of energy output

Technology that applies the concept of energy efficiency

Textbook page 196:
1. Compact fluorescent lamp (CFL)
2. LED lamp
3. Various electrical appliances
4. Solar panels
5. Electric vehicles

Energy efficiency
labelling by the
Energy
Commission

Current, I Power , P
(Unit: Ampere, A) (Unit: Watt, W)

Voltage, V
(Unit: Volts, V)

P=IxV

I =


Same formula V =
used to solve
problems on
fuse ratings

Give this a try!





Power = Work done per unit of time
S.I. Unit: Watt (W)

1W = 1 J / s or 1 Js-1
(1 watt = 1 Joule of energy used to do work in 1
second)

Workbook page 106
Answer question 3 (a) (i)

Electrical energy used (kWh) = Power (kW) x Time (h)



Workbook page 106
Answer question 3 (a) (ii)





Cost of electrical energy usage
= Power (kW) x Time of usage (h) x Cost per unit (RM)
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Solve the following:









Do the following:

Workbook page 107
Answer question 5 (a)

Workbook page 108
Answer questions 6, 7





Step 1:

Step 2:

Ways to save electrical energy consumption

The green building