Ohm's Law
True or False: Current and Resistance are directly proportional
False
True or False: Resistors in series carry the same current
True
This is the rate at which charge flows through a surface
Electric current
If the voltage applied across a resistor is doubled, how does this affect the current flowing through the resistor, assuming the resistance remains constant?
The current doubles
What is the voltage if a resistance of 25 Ω produces a current of 250 amperes?
6,250 V
Calculate the total current in a series circuit with resistors of 10Ω, 20Ω, and 30Ω connected in series to a 12V battery.
I = 0.2 A
Formula for equivalent resistance when resistors are in series
Req = R1 + R2 +...+ Rn
What are the units for resistivity?
Ωm
What is the resistance if a voltage of 35 volts produces a current of 7 amps?
5 Ω
A circuit consists of two resistors connected in series to a 19.5-Volt battery. Resistor A has twice the resistance of resistor B. What is the voltage drop across Resistor A?
13 V
This is a measure of the opposition to current flow in an electrical circuit
Electric resistance
A certain wire has a resistance R. What is the resistance of a second wire, made of the same material, that is half as long and has half the diameter?
2R
What is the current produced with a 9-V battery through a resistance of 100 Ω?
0.09 A
You are to connect resistors R1 and R2, with R1 > R2, to a battery, first individually, then in series, and then in parallel. Rank those arrangements according to the amount of current through the battery, greatest first.
Parallel, Individual with R2, Individual with R1, Series
Formula for equivalent resistance when resistors are in parallel
1/Req = 1/R1 + 1/R2 +...+ 1/Rn
This is the average velocity that charged particles, such as electrons, attain due to an electric field
Drift velocity
In a series circuit with a 12-volt battery, if there are resistors of 4 ohms and 6 ohms in series, what is the current flowing through the circuit?
1.2 A
What resistance must be placed in parallel with a 155 Ω resistor to make the equivalent resistance 115 Ω?
R = 446 Ω
Formula for resistance of a resistor
R = ρL/A
During a 4 min interval, a 5.0 A current is set up in a wire. How many Coulombs pass through any cross section across the wire's width?
1.2 x 10³ C