Exam Primer

# 5.4 Ohm's law ## Practice

B-005-04-01
If a current of 2 amperes flows through a 50-ohm resistor, what is the voltage across the resistor?
48 volts
52 volts
100 volts
25 volts

B-005-04-02
How is the current in a DC circuit calculated when the voltage and resistance are known?
Current equals voltage divided by resistance
Current equals resistance multiplied by voltage
Current equals resistance divided by voltage
Current equals power divided by voltage

B-005-04-03
How is the resistance in a DC circuit calculated when the voltage and current are known?
Resistance equals current multiplied by voltage
Resistance equals voltage divided by current
Resistance equals power divided by voltage
Resistance equals current divided by voltage

B-005-04-04
How is the voltage in a DC circuit calculated when the current and resistance are known?
Voltage equals current divided by resistance
Voltage equals resistance divided by current
Voltage equals power divided by current
Voltage equals current multiplied by resistance

B-005-04-05
If a 12-volt battery supplies 0.25 ampere to a circuit, what is the circuit's resistance?
3 ohms
48 ohms
12 ohms
0.25 ohm

B-005-04-06
Calculate the value of resistance necessary to drop 100 volts with current flow of .8 milliamperes:
125 kilohms
125 ohms
1250 ohms
1.25 kilohms

B-005-04-07
The voltage required to force a current of 4.4 amperes through a resistance of 50 ohms is:
220 volts
2220 volts
22.0 volts
0.220 volt

B-005-04-08
A lamp has a resistance of 30 ohms and a 6 volt battery is connected. The current flow will be:
2 amperes
0.5 ampere
0.005 ampere
0.2 ampere

B-005-04-09
What voltage would be needed to supply a current of 200 mA, to operate an electric lamp which has a resistance of 25 ohms?
5 volts
8 volts
175 volts
225 volts

B-005-04-10
The resistance of a circuit can be found by using one of the following:
R = E/I
R = I/E
R = E/R
R = E X I

B-005-04-11
If a 3 volt battery supplies 300 mA to a circuit, the circuit resistance is:
10 ohms
9 ohms
5 ohms
3 ohms