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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
74646 Views

State and explain the effect of the following on the rate of a reaction: a) increasing temp b) increasing pressure c) increasing concentration of ONE reactant d) adding a catalyst. In each case state what will happen to the rate constant, k.

a) will increase greater collision energy so greater chance of activation energy being exceeded so greater fraction of successful collisions k increases b) will increase more particles per unit volume so col...
JP
Answered by Joseph P. • Chemistry tutor
4897 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
2687 Views

How do I know whether or not I should use the subjunctive mood after "que"?

The subjunctive mood is by definition a way of speaking that shows the speaker's personal attitude towards what they're saying. I'm sure that the textbook you're using explains all the basic situations when ...
JM
Answered by Jakub M. • French tutor
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