Electrical Concepts Recap

Which conductor is the odd one out?

• Aluminium

• Plastic

• Copper

Which insulator is the odd one out?

• Thermoplastic

• Ceramic

• Gold

The SI unit of mass is _______.

• Kilogram

• Gram

• Pound

• Ounce

The SI unit of time is _______.

• Second

• Minute

• Hour

• Day

The SI unit of electric current is _______.

• Ampere

• Volt

• Ohm

• Watt

What does the unit 'Volt' measure?

• PD/emf (voltage)

• Current

• Resistance

• Power

What is the unit symbol for 'Watt'?

• W

• Wt

• Wa

• Wt.

Which of the following units is used to measure Resistance?

• Volt

• Watt

• Ohm

• Joule

Why do electricians need an easier way to write down numbers?

• Because the numbers electricians use can be very large or very small.

• Because electricians do not like to write numbers.

• Because electricians only use even numbers.

• Because electricians want to save paper.

What is the purpose of using standard form when dealing with very large or very small numbers?

• To show a very large or very small number in an easier way and save confusion when dealing with lots of zeros.

• To make numbers look more complicated.

• To increase the value of the numbers.

• To convert numbers into fractions.