A laboratory temperature chamber has a metal outer casing and contains two independent heating elements.
The power rating of the temperature chamber is 520 W520\text{ W}520 W when running at full capacity. The chamber is connected to a 230 V230\text{ V}230 V mains supply.
State the equation linking power, current, and voltage.
Calculate the current in the temperature chamber. Give your answer to two significant figures.
Which of these mains fuses is the most suitable for the temperature chamber?
The two heating elements inside the chamber can be configured to run in series or in parallel. Describe one advantage of each configuration in this appliance.
Many electrical laboratory appliances are fitted with a three-core cable containing an earth wire.
Describe how an earth wire, together with a fuse, acts as a safety feature.
Explain why this laboratory temperature chamber must be fitted with an earth wire, whereas a centrifuge with a plastic casing does not require one.
