9: Electrical circuits (Activity)

What term is given to describe the allowance in the design current when calculating protective device rating and cable size?

What method of heat transfer is used by space heaters?

What type of lampholder uses a screw fitting?

What percentage of full load after the first ten amps allowance can be made for cooking appliances when calculating cable size?

What type of heater is installed inside a water cylinder?

What is the maximum voltage drop between the origin and any load point in a ring final circuit?

What is the maximum voltage drop between the origin and any load point in a lighting circuit?

• 3%

• 5%

• 7%

• 10%

What is the circuit current denoted by the term I_b?

What is the correction factor denoted by the term C_g?

What is the current carrying capacity of a cable denoted by the term I_t?