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Ohm’s Law
Multiple Choice

Choose the best response to complete the sentence or answer the question. You will need symbol font on your computer to see the Greek symbol omega.gif.

1 .       When 12 V are applied across a 68 omega.gif resistor, the current is [Hint]

 
 
 
 


2 .       When there is 12 mA of current through a 1.2 komega.gif resistor, the voltage across the resistor is [Hint]

 
 
 
 


3 .       If 24 V are applied across a resistor and there are 10.9 mA of current, the resistance is [Hint]

 
 
 
 


4 .       A current of 200 µA through a 6.8 komega.gif resistor produces a voltage drop of [Hint]

 
 
 
 


5 .       A resistance of 3.3 Momega.gif is connected across a 500 V source. The resulting current is approximately [Hint]

 
 
 
 


6 .       How much resistance is required to limit the current from a 12 V battery to 3.6 mA? [Hint]

 
 
 
 


7 .       An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately [Hint]

 
 
 
 


8 .       The current through a flashlight bulb is 40 mA and the total battery voltage is 4.5 V. The resistance of the bulb is approximately [Hint]

 
 
 
 


9 .       A resistor is connected across a 50 V source. What is the current in the resistor if the color code is red, orange, orange, silver? [Hint]

 
 
 
 


10 .       What is the voltage source for a circuit carrying 2 A of current through a 36 omega.gif resistor? [Hint]

 
 
 
 


11 .       If 750 µA is flowing through 11 komega.gif of resistance, what is the voltage drop across the resistor? [Hint]

 
 
 
 


12 .       Four amperes of current are measured through a 24 omega.gif resistor connected across a voltage source. How much voltage does the source produce? [Hint]

 
 
 
 


13 .       What is the approximate resistance of a rheostat if the voltage source is 18 V and the current flow is 220 mA? [Hint]

 
 
 
 


14 .       Twelve volts are applied across a resistor. A current of 3 mA is measured. What is the value of the resistor? [Hint]

 
 
 
 


15 .       What is the approximate filament resistance of a light bulb if it operates from a 110 V source and 0.6 A of current is flowing? [Hint]

 
 
 
 


16 .       What is the approximate resistance setting of a rheostat in which 650 mA of current flows with a 150 V source? [Hint]

 
 
 
 


17 .       A 120 V lamp-dimming circuit is controlled by a rheostat and protected from excessive current by a 3 A fuse. To what minimum resistance value can the rheostat be set without blowing the fuse? Assume a lamp resistance of 20 ohms. [Hint]

 
 
 
 


18 .       You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed? [Hint]

 
 
 
 


19 .       If you wish to increase the amount of current in a resistor from 120 mA to 160 mA by changing the 24 V source, what should the new voltage setting be? [Hint]

 
 
 
 


20 .       How much voltage is needed to produce 2.5 A of current through a 200 omega.gif resistor? [Hint]

 
 
 
 


21 .       Approximately how many milliamperes of current flows through a circuit with a 40 V source and 6.8 komega.gif of resistance? [Hint]

 
 
 
 


22 .       Approximately how much current flows through a 3.3 Momega.gif resistor across a 30 V source? [Hint]

 
 
 
 


23 .       How much current is produced by a voltage of 18 kV across a 15 komega.gif resistance? [Hint]

 
 
 
 


24 .       How much resistance is needed to draw 17.6 mA from a 12 volt source? [Hint]

 
 
 
 


25 .       The formula to find I when the values of V and R are known is [Hint]

 
 
 
 






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