Charge
The basic definition of electric current.
What is I=\dfrac{\Delta q}{\Delta t} (charge per time)?
This quantity is often described as the “push” that makes charge move.
What is potential difference (voltage)?
The relationship connecting voltage, current, and resistance.
What is V=IR ?
The current rule for a series circuit.
What is the current is the same everywhere? I_1=I_2=I_3=\cdots
The voltage rule for parallel circuits.
What is the voltage is the same across each branch? V_{\text{bat}}=V_1=V_2=V_3=\cdots
A 12.0 V battery is connected in parallel to a 6.0 Ω and a 12.0 Ω resistor. Determine the equivalent resistance of the circuit, the total current from the battery, and the current in the 6 Ω branch and the 12 Ω branch.
R_{eq}=4 \ \Omega
I_{\text{battery}} = 3 \ A
I_{12\Omega}= 1 \ A \quad | \quad I_{6\Omega}= 2 \ A
A circuit requirement: without this, current stops immediately even if a battery is present.
What is a closed loop (complete path)?
Work per unit charge is measured in this unit.
What is the volt (V)?
The unit of resistance.
What is the ohm (Ω)?
"Lululemons" - Ella
The equivalent resistance rule for series resistors.
What is R_{\text{eq}}=R_1+R_2+R_3+\cdots$ ?
The current rule for a parallel circuit.
What is I_{\text{total}}=I_1+I_2+I_3+\cdots ?
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If 6.0 C of charge passes a point in 3 s, this is the current.
What is 2 A?
The equation that defines potential difference using work and charge.
What is \Delta V=\dfrac{W}{q} ?
A wire property: increasing wire length makes resistance do this (assuming the same material and area).
What is increase?
Two resistors 2 Ω and 4 Ω in series have this equivalent resistance.
What is 6 Ω?
The equivalent resistance rule for parallel resistors.
What is \frac{1}{R_{\text{eq}}}=\frac{1}{R_1}+\frac{1}{R_2}+\cdots ?
The SI unit of electric charge.
What is the coulomb (C)?
The maximum potential difference a battery can provide.
What is electromotive force (emf)?
The resistance equation for a uniform wire in terms of resistivity, length, and area.
What is R=\rho\dfrac{L}{A} ?
A series circuit has two bulbs. If one bulb is removed (open), the other bulb does this.
What is turn off?
Two 6 Ω resistors in parallel have this equivalent resistance.
What is 3 Ω?
The direction that Regents circuit arrows use, even though electrons move the other way in metals.
What is conventional current?
In a series circuit, the battery voltage equals this relationship.
What is V_{\text{bat}}=V_1+V_2+V_3+\cdots ?
For most conductors, as temperature increases, resistance does this.
What is increase?
In series, if you add another resistor, the total current does this (battery voltage fixed).
What is decrease?
A key parallel fact: R_{eq} is always _________ than the smallest branch resistor.
What is smaller?