3/25/26, 2:35 PM
ience Engineering Electrical Engineering
ADWP ELECTRICAL MECHANIC TEST: KEY ORMULAS AND SAFETY
PROCEDURES EXAM QUESTIONA AND ACCURATE ANSWERS
1
Ohm's Law V = I × R — Voltage equals current times
resistance.
Formula for electrical power in P =V× I
watts
1/5
, 3/25/26, 2:35 PM
Formula for power using resistance P = I² × R or P = V² / R
Total resistance in a series circuit R_T = R1 + R2 + R3 + ...
Total resistance in a parallel circuit 1 / R_T = 1 / R1 + 1 / R2 + ...
Line vs phase voltage in a V_L = √3 × V_phase
balanced 3-phase Wye system
Line vs phase current in a balanced I_L = I_phase
3-phase Wye system
Line vs phase current in a balanced I_L = √3 × I_phase
3-phase Delta system
Formula for three-phase power P = √3 × V_L × I_L × PF
Voltage drop The reduction in voltage as electric current
flows through a conductor due to resistance.
RMS voltage Effective AC voltage equal to a DC voltage that
produces same heating effect.
2/5
ience Engineering Electrical Engineering
ADWP ELECTRICAL MECHANIC TEST: KEY ORMULAS AND SAFETY
PROCEDURES EXAM QUESTIONA AND ACCURATE ANSWERS
1
Ohm's Law V = I × R — Voltage equals current times
resistance.
Formula for electrical power in P =V× I
watts
1/5
, 3/25/26, 2:35 PM
Formula for power using resistance P = I² × R or P = V² / R
Total resistance in a series circuit R_T = R1 + R2 + R3 + ...
Total resistance in a parallel circuit 1 / R_T = 1 / R1 + 1 / R2 + ...
Line vs phase voltage in a V_L = √3 × V_phase
balanced 3-phase Wye system
Line vs phase current in a balanced I_L = I_phase
3-phase Wye system
Line vs phase current in a balanced I_L = √3 × I_phase
3-phase Delta system
Formula for three-phase power P = √3 × V_L × I_L × PF
Voltage drop The reduction in voltage as electric current
flows through a conductor due to resistance.
RMS voltage Effective AC voltage equal to a DC voltage that
produces same heating effect.
2/5
