Electricity and magnetism

Which power station uses firewood as the energy source?

• Nuclear

• Biomass

• Thermal

• Hydroelectric

The following are the examples of non renewable energy except .......

• Coal

• Petroleum

• Natural gas

• Tidal

What are the energy changes that occur in the thermal power station?

• Nuclear energy --> Heat energy --> Kinetic energy --> Electrical energy

• Potential energy --> Kinetic energy --> Electrical energy

• Chemical energy --> Heat energy --> Kinetic energy --> Electrical energy

• Kinetic energy --> Electrical energy

Tags

NGSS.HS-PS3-4

Generation of electrical energy in a generator is based on .....

• Movement of the wire

• Movement of the generator

• Movement of the transformer

• Movement of the magnet

.............. is a device used to display and measure the shape of graph, direction of current and voltage changes.

Tags

NGSS.HS-PS4-5

The diagram shows the ..........

Tags

NGSS.HS-PS2-5

An oven has been labelled with 3.5 kW, 240 V. What is the appropriate value of fuse for the oven?

Given : P (Power) = V (Voltage) x I (Current)

• 10 A

• 13 A

• 15 A

• 30 A

Diagram shows a 3 pin plug. What is the function of earth wire?

• Returns the current from homes to substations

• Records the amount of electrical energy that has been used

• Connects an appliance directly to earth as a safety measure

• Carries current at a voltage of 240V from the local substation to home

What is the energy efficiency of thr CFL bulb which has the input energy with 7 J and output energy with 4.8 J? Your answer must be in percentage (%)

Syazana irons her shirt with an electric iron marked 3 kW, 240 V for 10 minutes. What is the cost of electrical energy used if the rate is RM0.25 per unit?

• RM0.213

• RM0.128

• RM0.245

• RM0.125

Tags

NGSS.HS-PS3-1