Which one of these factors in a metal does NOT affect the resistance of a conductor?
The material
The length
The thickness
The density
When a wire carries electricity, it can get hot. This is because:
protons transfer energy to the metal ions, which vibrate more.
electrons transfer energy to the metal ions, which vibrate more.
electrons stop moving randomly.
there is a short circuit
Filaments in light bulbs are made of:
argon
gold
tungsten
uranium
The metal from which light bulb filaments are made have two properties that make it really useful for this purpose. Which one of the statements is the correct summary of the two properties?
It is very dense and very reactive.
It has a high melting point and is very hard.
It has a very low resistance and conducts heat very well.
It has a high resistance and melts at a high temperature.
Aluminium has properties that make it useful for electricity transmission. Which one of the statements best describes why aluminium is used?
It used to be a more precious metal than gold.
Aluminium has a low density and conducts electricity well.