PES 100 –Physics in Everyday Life – Essay Option Rubric
UNIT 3: (Chapters 12 – 14) Electric Charge, Circuits, Magnetism
Griffith ‘The Physics of Everyday Life’ 5th.ed.
Definitions
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Charge, conductor & insulator, polarized vs. ionized, conservation of charge, electric field, electric field lines, electric potential, equipotential lines, electric dipole, metals
and free electrons, quantum charges (proton and electron), coronal discharge
Current, resistance, battery & electromotive force, series & parallel, AC & DC current, power (supplied & used), capacitors, internal resistance
Magnetic poles, monopoles, Magnetic field lines, electromagnet, magnetic force & the right-hand rule, magnetic flux, induction, Lenz’s Law, Faraday’s Law, transformer
Units
SI units:
• Charge (coulomb, or C), electric field (N/C), voltage (volts, or V), electric force (N)
• Current (ampere, or A), resistance (Ohm, or Ω), electromotive force (volts, or V), power (watts, or W)
• Magnetic field strength (Tesla, or T, and Gauss, or G), magnetic force (N), magnetic flux (Weber, or Wb)
Relationships
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Electric Force, electric field & charge; Electric Force, two charges & distance between; Voltage, electric field & distance;
Current, charge & time; Resistance, current and voltage; Resistance, length, cross sectional area & material; batteries or resistors connected in series or parallel; Power
loss, resistance & current
Magnetic Force per unit length, current, distance; Magnetic Force, field strength, charge & speed; Magnetic flux, field strength, cross-sectional area; Current &
voltage vs. primary and secondary loops in a transformer; Voltage, change in flux & number of loops
Applications
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Lightning; Van deGraff generator & hair; Air cleaners, comb & paper bits; Parallel charged plates; Photocopiers; Fluorescent tubes
Simple circuit (battery & resistor); water analogy; voltmeter, ammeter & ohmmeter; batteries in series/parallel vs. lifetime & voltage
Electromagnet; parallel, current-carrying wires; electric motors & generators; transformers; inductive sensors
The following list of equations will be provided on the last page of the traditional multiple-choice exam.
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R. Gist
FE=k*q1*q1/r2, E=FE/q, ΔV=E*d
ΔV =I*R, I=Δq/Δt, PowerSupplied= ΔV*I, PowerUsed=I2*R, Requivalent=R1+R2 [series circuits], Requivalent=1/(1/R1+1/R2) [parallel circuits]
FB /L=(2*constant*I1*I2)/d, FB =B*q*v, ΔV = ΔΦ /t, Φ=Ν∗Β∗Α,
ΔVout=N2/N1*ΔVin,
Iout=N1/N2*Iin
R=resistance, I=current, E=electric field strength, B=Magnetic field strength, F=force, q=charge, ΔV=voltage, L=length, v=speed, t=time, Φ=magnetic flux, N=no. of
loops, A=cross-sectional area of one loop, d=distance between
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