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Formulas Chapter 20

# Formulas Chapter 20 - Chapter 20"Electric Circuits I q t...

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Chapter 20 - "Electric Circuits" I = q t I = current (amperes) q = charge (coulombs) t = time (seconds) Ohm’s Law V = IR V = voltage (volts) I = current (amperes) R = resistance (ohms) Resistance and Resistivity R = ρ L A R = resistance (ohms) ρ = resistivity (ohm-m) L = length (m) A = cross-sectional area (m 2 ) ρ = ρ o 1 + α ( T - T o ) [ ] ρ = resistivity at T (ohm-m) ρ ο = resistivity at T o (ohm-m) α = temperature coefficient of resistivity (C o ) -1 T = temperature ( o C) T o = temperature ( o C) R = R o 1 + α ( T - T o ) [ ] R = resistance at T (ohm-m) R ο = resistance at T o (ohm-m) α = temperature coefficient of resistivity (C o ) -1 T = temperature ( o C) T o = temperature ( o C) Power P = IV = I 2 R = V 2 R P = power (watts) I = current (amperes) V = voltage (volts) R = resistance (ohms)

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Alternating Current V = V o sin2 π ft I = I o sin2 π ft V = voltage (volts) V o = peak voltage (volts) f = frequency (Hz) t = time (seconds) I = current (amperes) I o = peak current (amps) (Note: 2 π ft will be in radians.) P = I o V o sin 2 2 π ft P = Power (watts) P = 1 2 I o V o _ P = Average Power (watts) I RMS = I o 2 I RMS = Root Mean Square Current (amps) V RMS = V o 2 V RMS = Root Mean Square Voltage (volts) P = I RMS V RMS = I 2 RMS R = V 2 RMS
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Formulas Chapter 20 - Chapter 20"Electric Circuits I q t...

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