5. Don’t Forget the Units!!!
Term Description Unit Symbol
Voltage (V or Electromotive Force Volts V
E)
Current (I) Rate of Electron Flow Amps A
Resistance (R) Opposition to electron flow Ohms Ω
Power (P) Rate of doing electrical work Watts W
Charge (Q) Quantity of accumulated Coulombs C
electrons
8. Series vs. Parallel Behavior
Series Parallel
V1+V2+V3…= VT = in parallel it stays the
same
In series it stays the same IT =I1+I2+I3…
R1+R2+R3…= RT =1/(1/R1 + 1/R2 + 1/R3 …)
P1+P2+P3…= PT =P1+P2+P3…
10. Make a VIRP Chart and
solve for unknown values
V I R P
1 1.27 2.7mA 470Ω 3.4mW
2 5.94 2.7mA 2.2kΩ 16mW
3 2.7 2.7mA 1kΩ 7.3mW
T 10V 2.7mA 3760Ω 27mW
11. Make a VIRP Chart and
solve for unknown values
V I R P
1 10V 21.3mA 470Ω 213mW
2 10V 4.55mA 2.2kΩ 45.5mW
3 10V 10mA 1kΩ 100mW
T 10V 35.8mA 279Ω 358mW