The ARRL Ham Radio License Manual

by American Radio Relay League

T5D04 — What is the resistance of a circuit in which a current of 3 amperes flows through a resistor connected to 90 volts? R = E / I = 90 V / 3 A = 30 Ω T5D05 — What is the resistance in a circuit for which the applied voltage is 12 volts and the current flow is 1.5 amperes? R = E / I = 12 V / 1.5 A = 8 W T5D06 — What is the resistance of a circuit that draws 4 amperes from a 12-volt source? R = E / I = 12 V / 4 A = 3 W T5D07 — What is the current in a circuit with an applied voltage of 120 volts and a resistance of 80 ohms? I = E / R = 120 V / 80 Ω = 1.5 A T5D08 — What is the current through a 100-ohm resistor connected across 200 volts? I = E / R = 200 V / 100 Ω = 2 A T5D09 — What is the current through a 24-ohm resistor connected across 240 volts? I = E / R = 240 V / 24 Ω = 10 A T5D10 — What is the voltage across a 2-ohm resistor if a current of 0.5 amperes flows through it? E = I × R = 0.5 A × 2 Ω = 1 V T5D11 — What is the voltage across a 10-ohm resistor if a current of 1 ampere flows through it? E = I × R = 1 A × 10 Ω = 10 V T5D12 — What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it? E = I × R = 2 A × 10 Ω = 20 V