Question 1
You are asked to calculate the line current of a 10 kW, three-phase, 208 V, 0.8 power factor motor with 90 percent efficiency. Approximately what is the line current?
Question 2
A 120 V circuit supplies a 12 Ω resistive load. Approximately how much current will flow?
Question 3
A 240 V circuit supplies a 20 A resistive load. What is the resistance of the load?
Question 4
A 120 V circuit supplies a 24 ohm resistive load. What is the current flowing in the circuit?
Question 5
A 120 V circuit supplies a load drawing 4 A. What is the resistance of the load?
Question 6
A single 60 W, 120 V incandescent lamp draws approximately how much current?
Question 7
A small office has a calculated general lighting load of 6 kVA at 120/208 V, 3-phase. Approximately what is the line current if the load is balanced across all three phases?
Question 8
A simple series circuit has a 120 V supply and a single load of 12 Ω. What is the current in the circuit?
Question 9
Which formula correctly relates power, voltage, and current in a DC or single-phase AC circuit?
Question 10
A 1500 W portable heater is plugged into a 120 V branch circuit. Approximately how much current does the heater draw?
Question 11
Ohm's law states that current in a circuit is directly proportional to:
Question 12
A lighting circuit draws 2 A at 120 V. What is the power consumed by the circuit?
Question 13
A 120 V circuit supplies a 24 Ω load. What is the current drawn by the load?
Question 14
A three-phase motor nameplate shows 600 V, 15 A. Approximately what is its three-phase power rating assuming a power factor of 0.8?
Question 15
A 120 V circuit supplies a 24 Ω resistive load. What is the current in the circuit, assuming ideal conditions?
Question 16
A three-phase 600 V motor draws 10 A at a power factor of 0.8. Approximately what is its output power in kilowatts, assuming ideal conditions and that mechanical losses are ignored?
Question 17
What is the effect on current in a simple circuit if the resistance is increased while the voltage stays the same?
Question 18
A 120 V circuit has a load drawing 5 A. What is the power consumed by the load?
Question 19
For a 120 V circuit with a total load resistance of 24 Ω, what is the circuit current?
Question 20
Using Ohm's law, what is the current in a 120 V circuit with a load resistance of 60 Ω?
Question 21
A 120 V portable drill is marked 5 A. Approximately how much power in watts does it draw at rated load?
Question 22
If the resistance of a heater is 24 Ω and it is connected to a 120 V supply, what is the current drawn?
Question 23
A 2 kW baseboard heater is connected to a 240 V supply. What current does it draw?
Question 24
A 120 V circuit supplies a lamp that draws 2 A of current. What is the resistance of the lamp?
Question 25
A 1500 W baseboard heater is supplied by a 240 V circuit. Approximately how much current does it draw?
Question 26
What is Ohm's law relationship between voltage (V), current (I), and resistance (R)?
Question 27
An apprentice measures 10 ohms of resistance across a heating element. If 120 V is applied, what current will flow?
Question 28
A nameplate on a tool reads 120 V, 10 A. Approximately what is its rated power?
Question 29
A 25 kVA single-phase transformer feeds a panel at 240 V. Assuming full load at unity power factor, approximately what is the full-load current on the secondary?
Question 30
A simple circuit has a 120 V supply and a load drawing 6 A. What is the resistance of the load?