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Q2.1 How much electricity does a lamp use?

Discover how much electricity a lamp uses up while it is turned on & in use?

CORE CONCEPTS:

When electricity flows through a lamp filament, it gets changed entirely into light.

Despite this, and possibly most surprisingly. not one bit of electricity is ever used up by the light bulb, and all the electricity flows out of the filament and back down the other wire

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Q 2.1 SO WHAT DO ELECTRICITY COMPANIES BILL US FOR:

Q2.3 Electricity flows inside metal wires:

Electricity does NOT flow inside metal wires.

'As a consequence of having a current in the wires, there is a magnetic field
 in the space around the wires.

 It is this combination of electric field and magnetic field in the space
 outside the wires that carries the energy from battery to globe.

 Once the fields are set up, the energy travels through space, perpendicular
 to both the electric field and the magnetic field, at the speed of light.'

Reference: Ian M. Sefton - Sydney University Physics 2002

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