Electrical Quantities

Question 1

Charge, work, voltage

Answer 1

V=W/Q

Question 1

Current, charge, time

Answer 1

Q=IT

Question 2

Current, voltage, resistance

Answer 2

R=V/I

Question 3

Power, voltage, current

Answer 3

V=P/I

Question 4

Voltage in series

Answer 4

Add to each other

Question 5

Voltage in parallel

Answer 5

Equal

Question 6

Current in parallel

Answer 6

Add to each other

Question 7

Current in series

Answer 7

Equal

Question 8

define current

Answer 8

the rate at which electric charge passes a point in a circuit

Question 9

direction of current

Answer 9

positive to negative

Question 10

direction of electron flow

Answer 10

negative to positive

electrons are negative, opposites attract

Question 11

how do batteries work

Answer 11

chemical reaction in battery causes new electrons to flow into wire and move the stationary ones which were already there around the circuit –> current!

Question 12

instrument that measures current

Answer 12

ammeter

Question 13

what is an ammeter

Answer 13

instrument that measures current

Question 14

current units

Answer 14

amperes (A)

Question 15

how to connect an ammeter

Answer 15

in series

Question 16

charge unit

Answer 16

coulombs (C)

Question 17

how many mA in an A

Answer 17

1000

Question 18

series vs parallel

Answer 18

series: current flows through all components which are connected in a continuous line
parallel: branching components, current doesn’t need to flow through all

Question 19

define voltage

Answer 19

the work done by charge passing through an electrical component

Question 20

voltage unit

Answer 20

volts (V)

Question 21

what is a voltmeter

Answer 21

instrument that measures voltage

Question 22

what instrument measures voltage

Answer 22

voltmeter

Question 23

how to connect a voltmeter

Answer 23

in parallel

Question 24

define emf

Answer 24

the work done by a source in moving a unit of charge around a circuit

Question 25

define resistance

Answer 25

the opposition of a component to the flow of electrical current through it

Question 26

voltage vs potential difference vs electromotive force

Answer 26

v = the work done by a unit of charge across an electrical component p.d. = same as voltage e.m.f = the work done by a source in moving a unit of charge around a circuit (voltage across terminals of a source)