Physics Flashcards - DC and AC Circuits
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(T/F) In DC current, the charge flows in one direction only.
(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?
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 = (current)(voltage) = iV = i2R = V2/R
What is the formula for calculating resistance given resistors in series?
Rs = R1 + R2 + R3 + ....+ Rn
What is the formula for calculating resistance given resistors in parallel?
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?
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?
(T/F) As plate area increases, capacitance increases proportionally.
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?
What is the formula for calculating capacitance given capacitors in parallel?
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?
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