Basic Electricity

3 State Ohm’s Law and apply it to single resistor circuits.

4 Apply Ohm’s Law to series resistance circuits.

5 Apply Ohm’s Law to parallel resistance circuits

6 List the factors affecting resistance

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

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

2 Pole Switches

Upward motion to close switch so it doesn't "fall" closed due to gravity

I = V/R

V= IR

R=V/I

Total resistance in circuit = sum of individual resistances

Reciprocal of Total Resistances = Sum of Reciprocals of Individual Resistances

RT = R1 + R2 + R3

1/Rt = 1/R1 + 1/R2 + 1/R3

A conductor’s resistance is directly proportional to its length.

A conductor’s resistance is inversely proportional
to its cross-sectional area.

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