Question 31
A 120 V heater draws 6 A of current. What is the approximate resistance of the heater element?
Question 32
A small office requires a general lighting load calculation. If the code requires 1 W per square foot and the office is 250 square feet, what is the minimum lighting load to be used in the calculation?
Question 33
Which formula correctly represents Ohm's law for a simple DC circuit?
Question 34
An electric heater is connected to a 120 V supply and draws 6 A of current. What is the resistance of the heater?
Question 35
A 240 V water heater draws 10 A at its rated load. Approximately how much power does it consume?
Question 36
A transformer with a turns ratio of 4:1 has a secondary voltage of 120V. What is the primary voltage?
Question 37
A 240V heater is rated at 4800 Watts. What is its resistance?
Question 38
Which of the following is the primary unit used to measure the 'True Power' consumed in an AC circuit?
Question 39
A 120V electric heater is drawing a constant current of 12A. What is the calculated resistance of the heating element?
Question 40
You measure 5 A of current flowing in a 24 Ω resistor. Approximately what voltage is across the resistor?
Question 41
In a simple series circuit with a 12 V source and a single 6 Ω resistor, what is the circuit current?
Question 42
A 3-phase, 4-wire, 208/120 V panelboard supplies a balanced three-phase motor load of 18 kW at 208 V. Ignoring power factor for simplicity, what is the approximate line current?
Question 43
If a 60 W, 120 V lamp is connected to a 120 V supply, approximately how much current does it draw?
Question 44
A 10 Ω resistor is connected across a 50 V DC supply. What is the current through the resistor?
Question 45
Using Ohm's law, what current flows in a 120 V circuit with a load resistance of 24 Ω?
Question 46
A 240 V single-phase motor draws 10 A at full load. What is its approximate output power in watts, assuming unity power factor?
Question 47
A 3-phase, 208 V motor draws 15 A on each phase at full load with unity power factor. Approximately what is its power in kilowatts?
Question 48
Which of the following best describes Ohm's law?
Question 49
A 120 V heater draws 10 A. What is the approximate power consumed by the heater?
Question 50
A 240 V circuit supplies a 24 ohm resistive load. What is the current in the circuit?
Question 51
According to Ohm's law, what happens to the current in a simple circuit if the resistance increases while the voltage stays the same?
Question 52
A 120 V circuit supplies a 60 W lamp. Approximately how much current flows in the circuit?
Question 53
A 120 V circuit supplies a 60 W incandescent lamp. Approximately how much current does the lamp draw?
Question 54
A 10 Ω resistor is connected across a 24 V DC supply in a control circuit. What current will flow through the resistor?
Question 55
A 120 V circuit supplies a load drawing 5 A. Using Ohm's law, what is the approximate resistance of the load?
Question 56
A 120 V branch circuit supplies a 12 Ω resistive load. What current will flow in the circuit?
Question 57
A lighting circuit operates at 120 V and the connected load draws 2 A. What is the power consumed by the load?
Question 58
A 60 W lamp is connected to a 120 V supply. Approximately how much current does the lamp draw?
Question 59
An electrician measures 24 ohms of resistance on a heating element supplied by 240 V. What is the current drawn by the element?
Question 60
A 120 V circuit supplies a load drawing 4 A. What is the resistance of the load, assuming purely resistive conditions?