Electrical Basics
This electrical quantity is measured in amperes.
What is electric current?
This circuit arrangement provides only one path for current.
What is a series circuit?
One kilowatt equals this many watts.
What is 1,000 watts?
This tool removes conductor insulation without intentionally cutting the conductor.
What is a wire stripper?
A cord has exposed copper where its jacket and insulation are damaged. This is the proper immediate action.
What is stop using it and remove it from service?
This opposition to current flow is measured in ohms.
What is resistance?
Each branch in this circuit arrangement has the same voltage across it.
What is a parallel circuit?
A 120-volt load draws 5 amperes at unity power factor. This is its power.
What is 600 watts? (P = V x I.)
This tool removes sharp burrs from the inside of freshly cut EMT.
What is a conduit reamer?
When a portable ladder may contact exposed energized parts, its side rails must have this electrical property.
What is nonconductive?
This type of current periodically reverses direction.
What is alternating current (AC)?
A 4-ohm resistor and an 8-ohm resistor connected in series have this total resistance.
What is 12 ohms?
A 240-volt resistance heater uses 4,800 watts. This is its current.
What is 20 amperes? (I = P / V.)
This tool pulls a leader through a raceway so conductors can be attached and pulled.
What is a fish tape?
This energy-control procedure uses personal locks and identification tags to prevent unexpected energization.
What is lockout/tagout?
With resistance unchanged, doubling the applied voltage has this effect on current.
What is doubling the current?
Two 12-ohm resistors connected in parallel have this equivalent resistance.
What is 6 ohms?
A 1.5-kilowatt heater runs for 4 hours. This is the electrical energy used.
What is 6 kilowatt-hours?
This adjustable tool tightens a terminal to a specified inch-pound value.
What is a torque screwdriver or torque wrench?
A panel breaker is OFF, but nobody has verified absence of voltage. For safety, the exposed conductors must still be treated this way.
What is energized?
A 1,200-watt resistance heater operates at 120 volts. This is its resistance.
What is 12 ohms? (R = V squared / P = 14,400 / 1,200.)
A 6-ohm branch and a 3-ohm branch are in parallel across 12 volts. This is the total source current.
What is 6 amperes? (12/6 + 12/3 = 2 + 4.)
A 120-volt source supplies a load at 116.4 volts. This is the voltage drop as a percentage of the source voltage.
What is 3 percent? ((120 - 116.4) / 120 x 100.)
A standard twist drill tends to grab thin sheet metal when enlarging a knockout. This stepped cutting tool is designed for progressively larger holes in sheet metal.
What is a step bit?
After isolating and locking out all identified supplies, a qualified person verifies absence of voltage. This additional supply condition must be considered even when the normal source is disconnected.
What is backfeed or induced voltage?