Table of Contents
Voltage Drop Calculation #
- Vdrop is the voltage drop in volts (V),
- L is the one-way length of the run in feet (ft),
- I is the current in amperes (A),
- R is the resistance of the wire in ohms per thousand feet (Ω/kft).
Ohm’s Law #
Defines the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit.
V=I×R
- Voltage (V) is measured in volts (V).
- Current (I) is measured in amperes (A).
- Resistance (R) is measured in ohms (Ω).
Power Equation #
- P=V×I
- Power (P) is measured in watts (W).
Relates electrical power (P) with voltage (V) and current (I).
Power in terms of Resistance and Current #
Derived from Ohm’s Law and the Power equation.
- P=I² × R
Power in terms of Voltage and Resistance #
Also derived from Ohm’s Law and the Power equation.
- P=V² x R
Kirchhoff’s Voltage Law (KVL) #
States that the sum of all electrical voltages around any closed network is zero.
- ∑V=0
- This principle is used to calculate unknown voltages in a circuit loop.
Kirchhoff’s Current Law (KCL) #
States that the total current entering a junction must equal the total current leaving the junction.
- ∑I in = ∑I out
Capacitance and Charge #
Describes the relationship between the charge (Q) stored in a capacitor, its capacitance (C), and the voltage (V) across it.
- Q=C×V
- Charge (Q) is measured in coulombs (C).
- Capacitance (C) is measured in farads (F).
Inductive Reactance #
Determines the reactance (X_L) offered by an inductor at a certain frequency (f).
- XL = 2 π f L
- XL is measured in ohms (Ω).
- Frequency (f) is measured in hertz (Hz).
- Inductance (L) is measured in henrys (H).
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