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42 Cards in this Set
- Front
- Back
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What is Coulomb's Law?
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Fe=(KQQ)/r^2
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Is electric force a vector?
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Yes!!
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Fe
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Electric Force
Measured in: Newtons |
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Q1 and Q2
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magnitudes of charges<--no negative
Measured in: Coulombs |
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r
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distance between charges
Measured in: Meters |
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K
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9*10^9 <--a constant
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Force attracts...
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unlike charges
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Force repels...
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like charges
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How is electric force like gravity?
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Acts at a distance
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What does the Electric Field depend on?
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Distance
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What charges are test charges?
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Positively charged
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Positively charged
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Protons
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Negatively charged
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Electrons
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Neutrally charged
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Neutrons
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Electric Field
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the force on a test charge, per unit charge in test charge
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Formula for Electric force?
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F=qE
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F?
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Elec force
Measured in: newtons |
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q?
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Charge on test charge
Measured in: coulombs |
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E?
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Elec. field <--vector
Measured in: Newtons per coulomb |
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How is the direction of the Electric field defined as?
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Defined as the direction of a force on a positive test charge.
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Electric field formula
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E=(KQ)/r^2
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Q def
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charge creating the elec field
Measured in: coulombs |
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Electric Potential (def)
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Symbol: V
The PE per unit charge Units: V |
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Electric Potential (formula)
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V= PEelec/q
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What is electric potential a property of?
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Location
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Work=
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W=qV
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PE formula
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PE=qV
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How does an electric field point?
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Away from +, toward -, from high V to low V
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Charged plates, uniform E, formula
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V=Ed
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V:
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elec. potential DIFFERENCE between plates
Measured in: volts |
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d:
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distance between plates
Measured in: meters |
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E:
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UNIFORM elec. field between plates
Measured in: N/C or V/M |
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Elec potential due to a point charge
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V=(KQ)/r
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Electric Current (def)
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Symbol: I
Unites: Amps or A The rate at which charge flows |
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Electric Current (formula)
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I= Q/T
Q= I*T |
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Conventional Current
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The direction that a positive charge would flow through a current
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Resistance (def)
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Symbol: R
Units: Ohm the ratio of potential difference to current |
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Resistance (formula)
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R= V/I
V=I*R |
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How to increase resistance:
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Long wire
Decrease Cross section area Hot wire |
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Power (def)
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rate of energy transfer
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Power (formula)
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P=IV
P=I^2*R P= V^2/R |
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Resisters in Series
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Req=R1+R2...
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