Wheatstone bridge British scientist and inventor 1802-1875 Charles Wheatstone Samuel Hunter Christie, British scientist and mathematician.

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Presentation transcript:

Wheatstone bridge

British scientist and inventor Charles Wheatstone Samuel Hunter Christie, British scientist and mathematician

Wheatstone English concertina

Why does a light bulb burn out when you switch the light on and never when you turn it off?

The amount of current drawn by a given device is determined by its power input The current in a 100-W light bulb is

A kitchen circuit An 1800-W toaster, a 1.3-kW electric frying pan, and a 100-W lamp are plugged into the same 20-A, 120-V circuit. a)What current is drawn by each device, and what is the resistance of each device? b)Will this combination blow the fuse?

To prevent the fuse from blowing, you replace the fuse with one rated at 40 A. Is this a reasonable thing to do?

The Magnetic Field

The force on a charge q moving with a velocity The magnitude of the force

left-hand rule right-hand rule

The angular velocity

Have a great spring break!