Electrical test

Question 1

Atom

Answer 1

Smallest particle of an element

Question 2

Nucleus

Answer 2

Has protons and uncharged particles called neutrons

Question 3

Atomic number

Answer 3

The number of protons a element has.

Question 4

Ammeter

Answer 4

An electrical instrument used to measure current

Question 5

Ampere

Answer 5

The unit of electral current

Question 6

Atom

Answer 6

the smallest particle of an element

Question 7

AWG

Answer 7

American Wire Gauge; a standardization based on wire diameter

Question 8

Charge

Answer 8

can be - or +

Question 9

Circuit

Answer 9

Has a source, a load, and an interconnecting current path

Question 10

Conductance

Answer 10

The ability of a circuit to allow current. The unit is siemens (S)

Question 11

Coulomb

Answer 11

The unit of electrical charge 6.25 x 10^18

Question 12

Closed circuit

Answer 12

A circuit with a complete current path

Question 13

Coulombs law

Answer 13

V=W/Q

Question 14

Current

Answer 14

The rate of flow of charge (free electrons)

Question 15

Current Source

Answer 15

A device that produces a constant current for a varying load

Question 16

DMM

Answer 16

Digital multi meter; an electronic instrument that combines meters for measurement

Question 17

Fuel cell

Answer 17

a device that converts electrochemical energy from an external source into dc voltage . the hydrogen fuel cell is the most common one

Question 18

Fuse

Answer 18

a protective device that burns open when there is excessive current in circuit

Question 19

Ground

Answer 19

The common or reference point in a circuit

Question 20

Load

Answer 20

an element (resistor or other component) connected accross the output terminals of a circuit that draws current from the source and upon which work is done

Question 21

Ohm

Answer 21

the unit of resistance

Question 22

Ohmeter

Answer 22

An instrument for measuring resistance

Question 23

Open circuit

Answer 23

Not a complete current path

Question 24

Potentiometer

Answer 24

A three terminal variable resistor

Question 25

Resistance opposition to current. The unit is the ohm

Question 26

A rheostat

Answer 26

a two terminal variable resistor

Question 27

Volt

Answer 27

the unit of voltage or electromotive force

Question 28

Resistance of a wire depends on

Answer 28

Type of material, length of wire, cross sectional area

Question 29

How to generate DC voltage

Answer 29

batteries, solar cells, generators (DC, AC) power supply, thermocouples

Question 30

Variable resistors

Answer 30

Potentiometer: to divide control voltage Rheostat:to control current

Question 31

Electrical current

Answer 31

The rate of flow charge