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What is the difference between voltage and current?

The voltage (or potential difference ) between two points is the cost in energy to move a unit of positive charge from the point of lower potential to the point of higher potential. Current is the rate of fl...
DW
Answered by Daniel W. • Physics tutor
3283 Views

What energy transfers are involved in you being able to move?

Firstly, energy transfers happen step by step. Almost all energy on Earth comes from the Sun. The Sun causes plants to photosynthesise so the energy becomes chemical energy in your food. When you eat your fo...
OL
Answered by Owen L. • Physics tutor
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What are the properties of electromagnetic waves?

EM waves invariantly travel at the speed of light, and can do so in a vacuum. They transfer energy from their source to the absorber. Some kinds of EM waves can be reflected and refracted. The spectrum of el...
LW
Answered by Liora W. • Physics tutor
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Please describe the structure of atom, with reference to the relative mass and charge.

At the centre of the atom, is the nucleus. This is made up of protons and neutrons. Protons are positively charged, with a relative charge of +1. Whilst neutrons are neutral (relative charge = 0).Surrounding...
EM
Answered by Elliott M. • Physics tutor
3358 Views

The charge that flows through the shower in 300 seconds is 18000C. The electric shower has a power of 13.8 kW. Calculate the resistance of the heating element in the shower.

Firstly, we want to define what information we know from the question: ∆Q = 18000C; ∆t = 300s, P = 13.8kW Therefore, to calculate the resistance we can use the power equation, P=I 2 R, and calculate the curr...
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Answered by Beth H. • Physics tutor
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