Electricity and Magnetism

Electricity and Magnetism

Generation of Electricity

Transformer

Transmission & Distribution of Electricity

Calculate the Cost of Electricity Consumption

Generation of Electricity

Describe source in term of renewable and non-renewable energy

Explain the process of generating electricity

Differentiate between DC and AC

Solve problem related to electricity supply

Renewable Energy

a source of energy whose suply is contineus and not exhaustive

Non-Renewable Energy

a source of energy whose supply will be exhausted, cannot be replaced nor aquired again

Multiple Select

Which of the following is a renewable energy?

• Geo-thermal

• Tide

• Radioactive

• Wave

Multiple Choice

Which of the following is renewable energy?

• Petroleum

• Natural Gas

• Biomass

• Coal

Fill in the Blank

Name the major source of electric supply in Malaysia

Electric Generator

• a tool used to convert mechanical energy into electricity

• electricity generated using electromagnetic induction

• coil of wire moves while cutting magnetic field lines

• producing alternating current

Fill in the Blank

Name the electric generator

Multiple Choice

Which of the following does not involves mechanical energy to electrical energy?

Type of current

• DC - Current flows in one direction

• AC - Current that changes its flow to the opposite direction at fixed interval

Multiple Select

What are the similarities of AC and DC

• Produce heat

• produce magnetic field

• suitable to step-up and step-down

• can be measured

Multiple Select

Select the source of direct current

• solar cell

• dry cell

• commutator dynamo

Multiple Select

What is the major problem in generating electricity?

• depletion of fossil fuels

• release of pollutants

Multiple Select

Which of the following is the pollutants that gives greenhouse effect

• carbon monoxide

• nitrogen dioxide

• sulfur dioxide

• hydrogen dioxide

Multiple Select

Power generation should...

• easy to find

• cheap

• not polluting nature

Poll

In your opinion, which of the following is the characteristics of a good energy source

• easy to find

• cheap

• not polluting nature

Transformer

• Step-up and step-down transformer

• use of transformer in electrical appliances

• solve numerical problem

Transformer

• a tool that can raise or lower down voltage of alternating current

• consists of laminated soft iron core and insulated conductor wire

Fill in the Blank

step-up and step-down transformer only work with...

Fill in the Blank

transformer change

Multiple Choice

electrical appliances works with low voltage, so they need

• step-up transformer

• step-down transformer

Multiple Choice

what is the type of transformer?

• step-up transformer

• step-down transformer

Numerical Problem

•  $\frac{V_p}{V_s}\ =\ \frac{N_p}{N_s}$  

Fill in the Blank

a transformer has the number of turns of the primary and secondary coils as 50 and 250 turns respectively. If the transformer output voltage is 60 V, what is the input voltage?

Fill in the Blank

A transformer has the ability to change the power supply AC 2kW, 240 V to 60 V.

What is the ratio of the number of turn primary to secondary transformer?

Transmission and Distribution of Electricity

Multiple Choice

During transmission of electricity, energy might lost to the surrounding.

What is the form of energy that lost to the surrounding?

• sound

• heat

• kinetic

• potential

Open Ended

What is the advantage of increase the voltage and reduce current in the cable to provide the same power?

Multiple Choice

name the type transformer used in switch zone

• step-up transformer

• step-down transformer

Multiple Choice

name the type transformer used in sub-station

• step-up transformer

• step-down transformer

Multiple Choice

What is the color of live wire

• blue

• yellow-green stripe

• brown

Fill in the Blank

Name the elctrical component attached to the live wire