SYMBOLS AND TERMS
This unit measures electrical current.
What is an ampere?
According to Ohm’s Law, voltage equals this times resistance.
What is current?
This type of current periodically reverses direction.
What is AC?
This type of reactance occurs in circuits with inductors.
What is inductive reactance?
Power is calculated using this formula.
What is P = VI?
This property resists the flow of electricity.
What is resistance?
Kirchhoff’s first law states that the sum of currents at a junction is always this.
What is zero?
Car batteries typically use this type of current.
What is DC?
Impedance combines these two properties.
What are resistance and reactance?
Long-distance transmission lines use this type of current.
What is AC?
The ability of a component to store electrical energy.
What is capacitance?
In a 24V circuit with 8A current, the resistance is this.
What is 3 ohms?
The effect where AC current concentrates near the outer conductor.
What is the skin effect?
The equation Z² = R² + X² represents this concept.
What is impedance?
AC power is converted to DC using this device.
What is a rectifier?
The formula P = VI represents this quantity.
What is power?
Kirchhoff’s second law states that the sum of voltages in a closed loop is always this.
What is zero?
AC circuits have this property that opposes current flow.
What is reactance?
In a circuit with R = 5Ω, XL = 10Ω, and XC = 3Ω, impedance is this.
What is 8.6Ω?
High-voltage power transmission reduces this electrical loss.
What is heat loss?
The simplest way to show an electrical circuit.
What is a ladder diagram?
What is the total resistance of two parallel resistors, 5Ω and 10Ω?
What is 3.34Ω?
The frequency of standard household AC power in the U.S.
What is 60 Hz?
The formula for inductive reactance.
What is XL = 2πfL?
The three-phase system delivers more power than this type of system.
What is single-phase?