Exploring Electrical Technology Concepts

What is the unit of electrical resistance?

• Ampere

• Ohm

• Volt

• Watt

Which of the following is a characteristic of a direct current (DC) system?

• Voltage varies with time

• Current flows in one direction

• Frequency is 50 Hz

• Voltage is always alternating

What is the primary purpose of a circuit breaker in an electrical system?

• To increase voltage

• To prevent electrical fires

• To convert AC to DC

• To store electrical energy

Which of the following is a non-renewable energy source?

• Solar power

• Wind power

• Coal

• Hydroelectric power

What is the formula for calculating electrical power in a circuit?

Which of the following is a method of power generation that uses the Earth's internal heat?

• Solar power

• Geothermal power

• Wind power

• Nuclear power

What is the main advantage of using alternating current (AC) over direct current (DC) for power distribution?

• AC is safer than DC

• AC can be easily transformed to different voltages

• AC is more efficient than DC

• AC is cheaper to produce than DC

Which of the following is a key component of an electromagnetic field?

• Electric charge

• Magnetic poles

• Electric current

• All of the above

What is the standard frequency of AC electricity in Great Britain?

• 40 Hz

• 50 Hz

• 60 Hz

• 70 Hz

Which of the following is a renewable energy technology?

• Natural gas

• Biomass

• Oil

• Coal