Phsi electricity 4

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Last updated 9:21 AM on 5/30/26
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40 Terms

1
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What is electric current?
The flow of electric charge.
2
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What is the formula for current?
I = ΔQ/Δt
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What is the SI unit of current?
Ampere (A)
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What is 1 ampere equal to?
1 C/s
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What is conventional current?
The direction positive charges would move.
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In metal wires, what particles actually move?
Electrons.
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How does electron flow compare to conventional current?
Electrons move opposite to conventional current.
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What is resistance?
The opposition to the flow of charge.
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What is the SI unit of resistance?
Ohm (Ω)
10
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What is Ohm's Law?
V = IR
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How can Ohm's Law be rearranged to find current?
I = V/R
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How can Ohm's Law be rearranged to find resistance?
R = V/I
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What is the formula for resistance in a wire?
R = ρl/A
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What does ρ (rho) represent?
Resistivity of the material.
15
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What happens to resistance if wire length increases?
Resistance increases.
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What happens to resistance if wire area increases?
Resistance decreases.
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What type of wire has the greatest resistance?
Long, thin wire.
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What type of wire has the lowest resistance?
Short, thick wire.
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What is electromotive force (EMF)?
The voltage supplied by a battery.
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Is EMF actually a force?
No, it is a voltage.
21
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What does Kirchhoff's junction law state?
Current entering a junction equals current leaving a junction.
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What does Kirchhoff's loop law state?
The sum of voltages around a closed loop equals zero.
23
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What is the total resistance for resistors in series?
Rtotal = R1 + R2 + R3 + ...
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What happens to resistance when resistors are added in series?
Resistance increases.
25
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What is the current relationship in a series circuit?
Current is the same everywhere.
26
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What is the voltage relationship in a series circuit?
Voltages add together.
27
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What is the voltage relationship in a parallel circuit?
Voltage is the same across all branches.
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What is the current relationship in a parallel circuit?
Current splits and adds across branches.
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What is the formula for resistors in parallel?
1/Rtotal = 1/R1 + 1/R2 + 1/R3 + ...
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What happens to total resistance when resistors are added in parallel?
Resistance decreases.
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Current
I = ΔQ/Δt
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Unit of current
A = C/s
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Ohm's Law
V = IR
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Current from Ohm's Law
I = V/R
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Resistance from Ohm's Law
R = V/I
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Resistance of a wire
R = ρl/A
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Kirchhoff's junction law
Current in = Current out
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Series resistance
Rtotal = R1 + R2 + ...
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Parallel resistance
1/Rtotal = 1/R1 + 1/R2 + ...
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Conventional current
Opposite direction to electron flow