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Basic Electricity (2 Describe basic electrical circuits. (Switch closed…
Basic
Electricity
3 State Ohm’s Law and apply it to single resistor
circuits.
I = V/R
V= IR
R=V/I
4 Apply Ohm’s Law to series resistance circuits.
Total resistance in circuit = sum of individual resistances
RT = R1 + R2 + R3
5 Apply Ohm’s Law to parallel resistance circuits
Reciprocal of Total Resistances = Sum of Reciprocals of Individual Resistances
1/Rt = 1/R1 + 1/R2 + 1/R3
6 List the factors affecting resistance
A conductor’s resistance is
directly proportional
to its length.
A conductor’s resistance is
inversely proportional
to its cross-sectional area.
1 Describe the atomic structure of matter and its relationship to electricity
Neutron
No charge
Part of nucleus
Proton
Charge +1
Part of nucleus
Electron
Charge -1
Orbits nucleus
7 Calculate the Power Developed in an Electrical Circuit
Power is rate of doing work
Basic unit of Electrical Power is Watt (W) or Kilowatt (kW)
If Voltage (E) and Current (I) known
P = E x I
If Current and Resistance are known
P = I^2 x R
If Voltage and Resistance are known
P = E^2/R
2 Describe basic electrical circuits.
Fuses protect circuits from overcurrent
Single Pole switches
Conventional flow positive to negative
Switch open - no current
Switch closed current flows
Upward motion to close switch so it doesn't "fall" closed due to gravity
2 Pole Switches
