Unit D - Section 2

Question 1

Superconductors

Answer 1

Perfect conductors - have no resistance flow

Question 2

Resistor

Answer 2

Allows electric current to pass but provides resistance to flow

Question 3

Resistance

Answer 3

A measure of how difficult it is elcetronsto flow through a substance

Question 4

Ohms

Answer 4

A unit of measurement for resistance

Question 5

Variable resistor

Answer 5

A device to measure resistance

Question 6

What is Ohm’s Law

Answer 6

If you increase the voltage in a circuit, the current also increases.

Question 7

Voltmeter

Answer 7

A device used to measure voltage

Question 8

Ammeters

Answer 8

Uses to measure electric current

Question 9

Galvanometers

Answer 9

Meters used to measure small currents

Question 10

Multimeters

Answer 10

Used to measure voltage, current or resistance

Question 11

Schematic

Answer 11

A drawing with symbols that represents a circuit

Question 12

Series circuit

Answer 12

Only one pathway for the current when the pathway that is interrupted the circuit cannot function

Question 13

Parallel circuits

Answer 13

Have a seperate current path for each section of the circuit; if a bulb is interrupted the rest of the circuit still functions

Question 14

What uses parallel circuits

Answer 14

Many household wiring

Question 15

Transistors

Answer 15

Transistors are tiny devices that are found in an electronic appliance

Question 16

What are transistors made out of

Answer 16

Made of solid material with no moving parts

Question 17

Microcircuits (integrated circuits)

Answer 17

A circuit on a extremely small scale
Microcircuits are made out of transistors and resistors

Question 18

What are microcircuits made out of

Answer 18

Made out of microscopic transistors and resistors

Question 19

An electric stove us connected to a 240- V outlet. If the current flowing through the stove is 20 A, what is the resistance of the heating element?

Answer 19

R = V / I
= 240 V / 20A
= R = 12 Ohms

Question 20

What does a source provide in a circuit

Answer 20

A source provides energy and supply of electrons

Question 21

What does a conductor provide in a circuit

Answer 21

Provides a path for the current

Question 22

What does a switching mechanism provide for a circuit

Answer 22

Provides turning it off and on

Question 23

What does a load convert in a circuit

Answer 23

Electrical energy into another form of energy

Question 24

Cell in a circuit

Answer 24

Stores energy

Question 25

Battery in a circuit

Answer 25

Combination of cells

Question 26

Lamp in a circuit

Answer 26

Converts electricity into light

Question 27

Resistor in a circuit

Answer 27

Controls the amount of current

Question 28

Swith in a circuit

Answer 28

Opens and closes the circuit

Question 29

Ammeter

Answer 29

Measures the amount of current

Question 30

Voltmeter

Answer 30

Measures voltage across a device

Question 31

Rheostat

Answer 31

Variable resistor

Question 32

Motor

Answer 32

Converts electricity into mechanical energy

Question 33

Fuse

Answer 33

Melts if the current is too high

Question 34

Voltage

Answer 34

Symbol is V
Unit is Volts (V)
Calculated with V = I × R
Measured with a Voltmeter

Question 35

Current

Answer 35

Symbol is I
Unit is Amperes (A)
Calculated with I = V / R
Measured with ammeter

Question 36

Resistance

Answer 36

Symbol is R
Unit is Ohms (Ω)
Calculated with R = V / I
Measured with Ohmmeter

Question 37

Polygraph

Answer 37

A lie detector that measures skin resistance, blood pressure and respiration. All of these changes happen and are detected when someone is lying; sweat is a good sign