Physics Flashcards - DC and AC Circuits

 (T/F) In DC current, the charge flows in one direction only. True. (T/F) In AC current, the charge flows in one direction only. False, in AC current, the flow of charge changes direction periodically. (T/F) By convection, the direction of current is the direction in which a negative charge would flow. False, the direction of current is the direction in which a positive charge would flow. What is the formula for Ohm's Law?  V = Volts = (current)(resistance) = iR How do the following affect the resistance of a conductor?  1. Increased length 2. Increased cross-sectional area 3. Increased temperature 4. Increased resistivity (ρ) 1. As length increases, so does resistance. 2. As cross-sectional area increases, resistance decreases. 3. As temperature increases, resistance typically increases. 4. As resistivity increases so does resistance. What is the formula for electrical power?  P = P = (current)(voltage) = iV = i2R = V2/R What is the formula for calculating resistance given resistors in series? Rs = Rs = R1 + R2 + R3 + ....+ Rn What is the formula for calculating resistance given resistors in parallel? Rp = What is Kirchoff's 2nd Law? Kirchoff's 2nd Law states that the sum of the voltage drops around a circuit loop equals the sum of the voltage rises around the loop. If 7A of current flow into a three way junction and 3A leave via one of the routes, how much current leaves via the other? 7A - 3A = 4A What is the formula for capacitance?  C = What are the units of capacitance? The units of capacitance are Farads. 1 Farad = 1 Coulomb/Volt What is the formula for the electric field between the plates of a capacitor? E = (T/F) As plate area increases, capacitance increases proportionally. True. Does the introduction of a dielectric material between the plates of a capacitor increase or decrease the capacitance? A dielectric material increases the capacitance.  The new capacitance (C') = CK, where K = dielectric constant. What is the formula for calculating capacitance given capacitors in series? Cs = What is the formula for calculating capacitance given capacitors in parallel? Cp = Cp = C1 + C2 + C3+ ... + Cn For AC current, what is the formula for calculating Irms? For AC current, what is the formula for calculating Vrms? Authorawc1990 ID212587 Card SetPhysics Flashcards - DC and AC Circuits DescriptionPhysics Flashcards - DC and AC Circuits Kaplan MCAT P42-P47 Updated2013-04-10T05:43:09Z Show Answers