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28 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Formula for a uniform electric field produced by a capacitor
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V=Ed
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Formula for charge on a capacitor
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Q=CV
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C is intrinsic
If Q increases only V increases |
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Formula for Capacitance
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C= Eo A/d
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Where capacitance is change by the AREA or distance ONLY
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Formula for PE of a capacitor
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PE= 1/2QV
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Q=CV can be sub to get different equations,
For problems with electron path remember: F=qE, F=ma and Big Fives! d=vot + 1/2at2 |
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Magnetic Force on a Moving charge
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F=q (VxB)
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Magnetic Field Strength
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F= qvBsin theta
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Units: Tesla
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Right Hand Rule 1
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Thumb=v
Fingers point direction of B Palm=Fb Proton is the convention, so if electron its opposite! |
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Do Magnetic Forces do work?
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NO! KE does not change!
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If v is perpendicular to B
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Uniform cir. motion
qvB=mv2/r |
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Right Hand Rule 2
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To find mag field created by a moving charge (wires and solenoids)
thumb= current Finger curl = mag field |
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B created by a long straight current carrying wire
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b is proportional to I/r
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What is a Capacitor?
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Two charged plates, equal magnitude, opposite charges which creates a potential difference
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What is a resistor and how is it related to power?
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resistors enable WORK to be done, power dissipation accross resistors = to power supplied by battery P=IV
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What is Current?
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the amount of charge per unit time (AMPs)
I=Q/t |
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What is Voltage?
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The potential difference
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Ohms Law
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V=IR
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Resistors in a Series have the same what and different what?
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Same I, different V
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Resistors in Parallel have same what and different what?
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Same V, Different I
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Electric Force between two charged particles
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F=k qQ/r2
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Electric Field (Two charges)
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F= kqQ/r2
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Electric Field created by a single point charge
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E(by Q)= k Q/r2
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Electric Force and Field Formula
For Vector Problems, F, a |
F=qE, f=ma
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Electric Potential
For Scalars, work and energy |
Pot=k Q/r
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Energy by electric field
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PE=q delta Potential
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Work done by electric field
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w= -deltaPE
KE=-deltaPE |
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Electrons move to higher or lower potential?
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Electron=light=rises to higher
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Protons move to higher or lower potential?
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Proton=heavier=falls to lower
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Superposition of Electric Potential
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Add all potentials
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