Uses & Dangers of Electric Heating Flashcards

All 5 cards in this deck

Give three appliances that make use of the heating effect of an electric current.

Kettle, toaster, electric heater (also hair dryer, iron, filament lamp).

Give two disadvantages of the heating effect of an electric current.

Energy is wasted, lowering efficiency; overheating can melt insulation or start a fire.

Why does the heating effect reduce the efficiency of a device such as an electric motor?

Some electrical energy is dissipated as thermal energy instead of being usefully transferred.

True or false? The heating effect of an electric current is always a disadvantage.

False. It is useful in devices such as kettles, toasters and electric heaters.

True or false? Too large a current in a cable can make the insulation melt and cause a fire.

True. The greater the current, the greater the heating effect in the cable.