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Physics
GCSE

explain how the resistance of a filament lamp changes as the potential difference across it increases

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.

Answered by safiya q. Physics tutor
5470 Views

explain the relationship between resistance and voltage in a filament lamp

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...

Answered by William P. Physics tutor
9556 Views

define 1 volt

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...

Answered by Alice D. Physics tutor
2310 Views

How does the red shift support the Big Bang theory?

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 ...

Answered by Isla C. Physics tutor
1672 Views

A car driver has to make an emergency stop. The braking distance depends on the speed of the car. For the same braking force, what happens to the braking distance if the speed doubles?

For a situation like this it is best to think of the energy of the car!The car has a kinetic energy = 1/2mv2 so if the speed has doubled the new kinetic energy of the car will be 1/2m(2v)2...

Answered by Alice D. Physics tutor
4272 Views

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