Physics Test

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What is the equation for Power?
Power (Watts, W) = Current (Amperes, A) x Voltage (Volts, V)
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Why is a metal a good conductor?
Has free electrons to carry charge.
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What is the unit of charge?
Charge is measured in coulombs (C)
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What is the charge of an electron?
negative = 1.6 x 10^-19 (e- = -1.6x10^-19C)
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Describe charges in Insulators?
You need to add or remove charges through friction.
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Describe charge in a Fluid or Liquid?
Charge carriers are the positive and negative ions.
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What is current?
The rate of flow of charge. 1A is equal to 1C passing through a single point in 1 second.
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What is the equation for Charge?
Charge (Q) = Current (I) x time (t)
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Describe the current movement?
Conventional current flows in the opposite direction to the electron movement. It flows positive to negative.
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Describe the electron flow movement?
It flows negative to positive.
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Describe potential difference?
The work done per unit of charge.
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What is the equation for potential difference?
p.d (Volts, v) = work done (Joules, J) / Charge (Coulombs, C)
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What does E.M.F stand for?
Electro motive force.
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What is the definition of E.M.F?
Electrical energy produced per unit charge passing a source.
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What is the equation for work done?
Work done = E.M.F x Charge or Work done = current x (delta) time x Voltage or Work done = Charge x Voltage
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What are the units for resistivity?
ohm m^-1
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What are the units for resistance?
Ohms
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What is a micro meter?
1 x 10^-6m
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What is the equation for resistivity of a wire?
Resistance x Cross section area / length
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Other cards in this set

Card 2

Front

Why is a metal a good conductor?

Back

Has free electrons to carry charge.

Card 3

Front

What is the unit of charge?

Back

Preview of the front of card 3

Card 4

Front

What is the charge of an electron?

Back

Preview of the front of card 4

Card 5

Front

Describe charges in Insulators?

Back

Preview of the front of card 5
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