Physics: Power and Resistance

Pregunta	Respuesta
What is voltage?	Voltage can be thought of as the pressure pushing charges along a conductor, while the electrical resistance of a conductor is a measure of how difficult it is to push the charges along.
What is the resistance of a material dependent on?	The resistance (R) of a material depends on its length, cross-sectional area, and the resistivity , a number that depends on the material:
What is power?	Power is the rate at which work is done.
1 W = ? J/s	1 W = 1 J/s
Which is cheaper? Power from a wall socket or power from a battery?	Wall socket is much cheaper
Batteries produce AC or DC currents?	DC
Wall sockets produce AC or DC current?	AC
If R= p/I^2 then what is the resistance of a 12 watts on a 3 watt current?	1.33' ohm

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	Creado por PatrickNoonan hace alrededor de 11 años