Ohm's Law: Formulas and Usage

Question 1

What formula is used to calculate voltage in a circuit? (T5D02)

Answer 1

Voltage (E) equals current (I) multiplied by resistance (R)

Question 2

What formula is used to calculate resistance in a circuit? (T5D03)

Answer 2

Resistance (R) equals voltage (E) divided by current (I)

Question 3

What formula is used to calculate current in a circuit? (T5D01)

Answer 3

Current (I) equals voltage (E) divided by resistance (R)

Question 4

What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts? (T5D04)

Answer 4

30 ohms

Question 5

What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes? (T5D05)

Answer 5

8 ohms

Question 6

What is the resistance of a circuit that draws 4 amperes from a 12-volt source? (T5D06)

Answer 6

3 ohms (R=E/I ** 12/4=3

Question 7

What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms? (T5D07)

Answer 7

1.5 amperes (I=E/R - 120/80=1.5)

Question 8

What is the current through a 100-ohm resistor connected across 200 volts? (T5D08)

Answer 8

2 amperes (I=E/R ** 200/100=2)

Question 9

What is the current through a 24-ohm resistor connected across 240 volts? (T5D09)

Answer 9

10 amperes (I=E/R ** 240/24=10)

Question 10

What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it? (T5D10)

Answer 10

1 volt (E=IR **0.52=1)

Question 11

What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it? (T5D11)

Answer 11

10 volts (E=IR ** 101=10)

Question 12

What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it? (T5D12)

Answer 12

20 volts (E=IR ** 102=20)