Download Ohm`s Law Problems

Ohm's Law Problems
Simple questions based on the law V = IR
What current would flow through a resistor of 20 ohms connected to a 12 V supply?
• [A] 240 A
• [B] 1.66 A
• [C] 0.67 A (correct answer)
• [D] 0.067A
What current would flow through a resistor of 40 ohms connected to a 10 V supply?
• [A] 400 A
• [B] 4 A
• [C] 0.25 A (correct answer)
• [D] 0.025A
A 100 ohm resistor is connected to a 20 V supply. What current flows?
• [A] 0.02 A
• [B] 0.05 A
• [C] 0.2 A (correct answer)
• [D] 0.5 A
• [E] 2000 A
What value of resistor would be used to permit a current of 0.2 A to flow using a 6V supply?
• [A] 0.03 ohms
• [B] 0.3 ohms
• [C] 3.0 ohms
• [D] 30 ohms (correct answer)
• [E] 300 ohms
What supply voltage would be needed to provide a current of 1.2 A through a 40 ohm resistor?
• [A] 48 V (correct answer)
• [B] 480 V
• [C] 0.3 V
• [D] 0.03 V
A resistor allows a current of 0.6 A to flow when connected to a 9.6 volt supply.
What current would flow if the same resistor was connected to a 12.8 V supply?
• [A] 0.2 A
• [B] 0.8 A (correct answer)
• [C] 22.4 A
• [D] 6.4 A
Calculate the voltage supply needed to produce a current of 12A when used with a 48 ohm resistor.
• [A] 0.25 V
• [B] 4 V
• [C] 60 V
•
• [D] 576 V (correct answer)
Calculate the voltage across a 300 ohm resistor when a current of 0.004 A flows through it.
• [A] 0.012 A
• [B] 0.012 V
• [C] 0.12 V
• [D] 1.2 V (correct answer)
• [E] 12 V
Find the size of resistor which would allow limit the current to a value of 0.02 A when connected to an 8 V
supply.
• [A] 0.16 ohms
• [B] 1.6 ohms
• [C] 16 ohms
• [D] 40 ohms
• [E] 400 ohms (correct answer)
Calculate the current that will flow when a total resistance of 500 ohms is placed in a circuit which has a 15
volt supply.
• [A] 0.00003 A
• [B] 0.0003A
• [C] 0.003 A
• [D] 0.03 A (correct answer)
• [E] 0.3 A