Electrical Theory

Question 1

Battery

Answer 1

Converts chemical energy to electrical energy

Question 2

Resistor

Answer 2

Opposes the flow of electrical current

Question 3

Capacitor

Answer 3

Device that has ability to store an electrical charge

Question 4

Diode

Answer 4

Device that allows current to flow in one direction, and blocks flow in the opposite direction
Two ends of the diode are:
- Anode (Positive)
- Cathode (Negative)

Question 5

Light Emitting Diode (LED)

Answer 5

Emits light when current passes through it in forward bias
Functions:
Allows current to flow when forward biased
Blocks current flow when reversed biased

Question 6

Inductor

Answer 6

Used to introduce inductance into a circuit

Stores energy by creating a magnetic field

Question 7

Transformer

Answer 7

Converts from a primary voltage and current value to a secondary voltage and current
Primary winding: H1/H2
Secondary Winding: X1/X2

Question 8

Contactor

Answer 8

Designed for switching higher voltages and currents

Used for 3-phase circuits

Question 9

Relays

Answer 9

Designed for switching lower currents and voltages

Used for single phase circuits

Question 10

Circuit Breaker

Answer 10

Protect circuits from excessive current conditions
Two methods of sensing: Thermal, Magnetic
Two primary functions: Used for circuit isolation, trip under over-current conditions

Question 11

Transducer

Answer 11

Change electrical properties so an electrical signal is sent to a control or display system
Can sense: Pressure, Temperature, Physical position

Question 12

Inductive sensors

Answer 12

Device that detects metallic objects in proximity to a sensor
Are used to determine speed

Question 13

Power supplies

Answer 13

Convert AC to DC

Question 14

Converters

Answer 14

Convert AC to DC

Question 15

Inverters

Answer 15

Convert DC to AC