Page 138 - Physics Form 5 KSSM_Neat

Table 3.16
Hours used in a
Electrical Quantity Power / kW Total energy usage / kWh
No. day / h
appliance (A) (B) (A µ B µ C)
(C)
Electric rice
1
KEMENTERIAN PENDIDIKAN MALAYSIA
cooker
2 Television
3 Lamp

5. Present the results of your findings.
Discussion:
1. Identify the electrical appliance in your home that consumes the highest electrical energy.
2. Suggest steps to reduce the cost of electricity consumption in your home.

Steps in Reducing Household's Electrical Energy Usage
Prudent use of electricity can help save and reduce the cost of electricity consumption at home.
Can you suggest some energy saving measures that you can do at home?

Steps in Reducing Household's Electrical Energy Usage

Close all windows and Switch off electrical Use only full loads of Use energy saving
doors when using the air appliances when laundry when using lamps to reduce
conditioner and ensure they are not in use to the washing machine. energy consumption.
that the air conditioner conserve energy.
filter is kept clean to cool
the room down faster and
more efficiently.

Figure 3.36 Steps in reducing household's electrical energy usage

Formative Practice 3.4

1. The output power of a battery is 80 W. Determine the electrical energy that is supplied by
the battery in:
(a) 10 seconds
(b) 2 hours

2. If the cost of electricity is 30 sen per unit, calculate the cost of using:
(a) 600 W LED television for 8 hours
(b) 1 kW vacuum cleaner for half an hour

128 LS 3.4.4 3.4.5