Chapter 12 Part 1 Flashcards
Atoms with several electrons in the outer orbit that are difficult to free such as glass, rubber, and plastic
Insulator
Smallest amount of a substance that can exist
Atom
Has a negative charge and travels around the nucleus in orbits or shells
Electron
A coil of wire designed to carry an electrical current producing a magnetic field
Solenoid
Unit of measurement for resistance
Ohm
What type of circuit?
Resistances are added together to obtain the total resistance in a circuit. Current is the same regardless of where it is measured in the circuit
Series circuit
Unit of measure for the charge a capacitor can store
Microfarad
Located in the nucleus of an atom and has a positive charge.
Proton
Used to measure current without breaking a circuit to install the meter
Clamp-on anmeter
Protects the circuit from an overload
Circuit breaker
Unit of measurement for power
Watt
Current that travels in one direction
Direct current (DC)
In a pure resistive circuit, current and voltage are in phase (True and False)
True
Fuses can be reset and used again (True and False)
False
A step down transformer with a 24V output, rated at 30VA, can draw a maximum current of 1.25A from the secondary (False or True)
True
If three light bulbs are wired in parallel and one bulb burns out, the current in the other two branches will increase (False or True)
False
Switches consume power (True or False)
False
In a series circuit, E total = E1 = E2 = E3 = (True or False)
False
The total equivalent resistance of a parallel circuit will always be less than the value of the lowest resistance (True or False)
True
Electromotive force is used to indicate the potential difference between two charges and the unit of measure is the amp (True or False)
False
The electricity that AC and heating technicians are more involved with is produced by light (True or False)
False
A step-down transformer has more turns of wire in the secondary than in the primary (True or False)
False
To increase a low amp reading to make it easier for an analog meter to detect, use the 10-wrap multiplier (True or False)
True
In a capacitive circuit, ___ lags ___
Volts, current
