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- Electric field strength
- q: the charge creating the field
- r: distance from the field (point in space)
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Electric field strength of a parallel plate capacitor
- E: electric field strength
- ΔV: change in potential of the plates (power source)
- d: distance between the plates
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- Potential at a point distance away from a charge
- Scalar quantity (+,-,0)
- q: central charge
- r: distance from that charge
epe=Vq (q=other charge)
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- Coulomb's law
- Interaction for point electric charges
- q: charges
- r: distance separating them
- Direction determined by hand via attraction/repulsion
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- If we place a charge within an electric field
- q: charge
- E: electric field strength
- Direction must be determined by hand via attraction/repulsion
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Work is equal to - change in epe or + change in ke
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- electric potential energy
- V: electric potential of a space (point distance)
- q: charge
-
- Work done on a charge in an electric field
- q: charge
- V: potential of the charge
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- Kinetic energy (normal)
- m: mass
- v: velocity
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Capacitance of a capacitor
- ε0: permativity of free space
- A: area of the plates of a capacitor
- d: distance between the plates
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- Ohm's Law
- Potential = current x resistance
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Equivalent resistance of resistors IN SERIES
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Equivalent resistance of resistors IN PARALLEL
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- P: power
- V: potential
- I: current
- R: resistance
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- Capacitance of a capacitor
- q: charge of plates
- V: voltage difference between plates
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Equivalent capacitor for capacitors IN PARALLEL
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Equivalent capacitor for capacitors IN SERIES
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- Energy stored in a capacitor
- U: epe
- C: capacitance
- V: voltage (potential)
- q: charge
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Power is equal to work over time
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Exponential decay of stored charge in a capacitor
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Exponential decay of current across a resistor (as resistance builds)
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Exponential growth of charge being stored in a capacitor
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Exponential decay of current in a capacitor (as charge builds)
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- Induced emf from change in magnetic field
- -: indicates that the direction opposes change
- N: number of loops
- ΔΦ: change in flux
- Δt: change in time
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- Force exerted on a wire from a magnetic field
- F: force
- I: current in wire
- L: length of wire in B field
- B: magnetic field strength
- θ: angle between I and B
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- Magnetic Flux
- A: surface area
- B: magnetic field
- θ: angle between magnetic field and **normal to area
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- Shell's law
- θ: angle between ray and NORMAL of surface
- n: refractive index
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- refractive index
- v: speed of light in substance
- c: speed of light in vaccum
- n: refractive index
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- (Electromagnetic wave)
- c: speed of light in vaccum
- f: frequency of wave
- λ: wavelength
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- d0: distance between object and mirror
- di: distance between image and mirror
- f: focal length
- f>0 converging lens, f<0 diverging lens
- di>0 real image, di<0 virtual image
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- M:
- hi: image height
- h0: object height
- d0: distance between object and mirror
- di: distance between image and mirror
- m<0 real, inverted image
- m>0 virtual, upright image
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