Scientific Principles PPT 9 - Basic Principles of Electricity

What is the unit for electromotive force (emf)?

• Ampere

• Ohm

• Volt

• Watt

Which unit is used to measure current?

• Volt

• Ampere

• Ohm

• Joule

What does the ohm measure in electrical terms?

• Voltage

• Current

• Resistance

• Power

What happens when the voltage is increased in a conductor?

• The resistance decreases

• The current decreases

• The force to cause electrons to flow increases

• The conductor melts

What is the unit of power for an appliance?

• Joules

• Kilowatt hours

• Watts

• Volts

How is electricity consumption typically measured for billing purposes?

• Watts

• Joules

• Kilowatt hours

• Volts

What is the relationship between watts, amps, and volts in electrical principles?

• Watts = Amps x Volts

• Amps = Watts x Volts

• Volts = Watts x Amps

• Watts = Volts / Amps

If an appliance needs 3kW in a domestic property, what is the fuse size?

• 10 amp

• 12.5 amp

• 15 amp

• 20 amp

In a domestic property, an appliance has a fuse size of 3 amp. What is the maximum power rating of the appliance?

• 500w or 0.5kW

• 600w or 0.6kW

• 720w or 0.72kW

• 900w or 0.9kW

An appliance has a 5 amp fuse and needs 1.2kW of power. What is the voltage required?

• 220v

• 230v

• 240v

• 250v