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An electric heater has a power of 1000W. It is connected to mains electricity (230V). The heater is equipped with an Earth wire. a) Calculate the current in the heater. b) Explain the role of the earth wire as a safety feature.

a) Use the equation P=IV where P is power in W, I is Current in Amps and V is voltage in volts. Rearrange to give I=P/V I=1000/230 = 4.34 A b) This is a wire connected to the metal casing of an electrical ap...
KS
Answered by Katie S. • Physics tutor
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How do you add and multiply surds?

When you add and subtract surds, the numbers inside the square root must be the same. You add/ subtract the number outside the square root. e.g. 2√5 + 7√5 = 9√5, however 2√5 + 7√3 cannot be added. when you m...
GC
Answered by Grace C. • Maths tutor
75132 Views

Que te gusta hacer en tu tiempo libre?

Para serte franca no tengo mucho tiempo libre porque tengo demasiados deberes de la escuela. Pero me encanta salir con amigos , y normalmente vamos al parque o al cinema. A veces tengo que ayudar en casa por...
KW
Answered by Kate W. • Spanish tutor
2777 Views

What affect does increasing demand have on price levels and consumer surplus?

By increasing demand levels, which often happens through a growing market and more buyer interest, you would experience a shift in the demand curve the right. This shift, whether in micro or macro economics,...
DE
Answered by Daisy E. • Economics tutor
2490 Views

How do I form the passé composé?

In French, the perfect tense (or passé composé ) is formed using the present tense of the verb avoir (for all verbs except for a few exceptions which use the present tense of the verb être) and what we call ...
BR
Answered by Briony R. • French tutor
3480 Views