Understanding Electrical Installation Principles

What is the unit of electrical resistance?

• Ampere

• Ohm

• Volt

• Watt

Which of the following is a conductor of electricity?

• Rubber

• Glass

• Copper

• Wood

What is the formula for calculating electrical power?

What is the frequency of the mains electricity supply in Great Britain?

• 50 Hz

• 60 Hz

• 100 Hz

• 120 Hz

Which of the following is a unit of electric charge?

• Coulomb

• Joule

• Newton

• Pascal

What is the purpose of a fuse in an electrical circuit?

• To increase current

• To decrease voltage

• To protect against overcurrent

• To store energy

Which of the following materials is commonly used as an insulator?

• Aluminium

• Silver

• Plastic

• Iron

What is the relationship between voltage, current, and resistance in Ohm's Law?

What is the typical voltage of a household electrical outlet in Great Britain?

• 110 V

• 120 V

• 230 V

• 240 V

Which of the following is a renewable source of energy?

• Coal

• Natural Gas

• Solar

• Nuclear