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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=I²R, and c...

as the potential difference increases, the current increases (ohm's law). this causes the temperature of the filament to increase, causing the resistance to increase.

As voltage increases across the filament, the current also increases. The increase in current causes the temperature in the filament to rise. The increase in temperature causes the resistance within the f...

A volt is a joule per coulomb.If you're struggling to remember try and picture the situation. Imagine current as individual units of charge passing through a battery. The charge has passed round the whole...

when we observed stars from the Earth, we noticed that almost all of the light emitting from the stars was being shifted to the red end of the spectrum. This indicates that the wave was essentially being ...