Fundamentals
What term is used for the rate at which charge flows through a conductor?
Electric current
What unit is used to measure electric power?
Watt
Watt is resistance?
the opposition to the flow of electric current?
In a parallel circuit, how are the components connected?
Across common points (All incoming points are connected, all outgoing points are connected)
In a series circuit, how many current paths are there?
1
What must a circuit have for current to flow?
A closed conducting path
What does a light bulb’s brightness depend on?
Power
What is Ohm's Law?
V=IR or R=V/I
In a parallel circuit, how does the voltage across each branch compare?
V_{eq} = V_1 = V_2 =V_3 \cdots
What is the relationship of current in a series circuit?
It is the same throughout
What physical thing moves in a circuit?
Electron
A 6.0 V battery creates 0.50 A current. What is the power?
3.0W
As temperature increases resistance __________
Increases
How is total resistance calculated in a parallel circuit?
1/{R_{eq}} = 1/{R_1} + 1/{R_2} + \cdots
What happens when one bulb burns out in a series circuit?
The circuit breaks
What causes a charge to move across an object in a circuit?
An applied potential difference
What are the 3 formulas for electrical power using voltage and current and resistance?
P=IV=\frac{V^2}{R}=I^2R
If the length of a wire is doubled, what happens to its total resistance?
It doubles
How can you tell car headlights are wired in parallel?
they remain lit even if one bulb fails
what is the equation for equivalent resistance in series?
R_{eq}=R_1+R_2+R_3+ \cdots
How is conventional current different from electron flow in circuit diagrams?
It flows in the opposite direction
A 150-ohm resistor carries 0.40 A for 30 seconds. How much energy is used?
720 J
If the diameter of a wire is quartered, what happens to its resistance?
16 times greater
What is the total resistance of a 2-ohm, 4-ohm, and 6-ohm resistor in parallel?
1.09 Ω ~ 1.1Ω
What is the voltage across a battery if the current going through two identical 5-ohm resistors in series is 2 A?
20V