electricity

Question 1

what is charge

Answer 1

a fundamental property that objects can have. it causes object to experience a force when in an electromagnetic field. either positive or negative has symbol (q) and measured in coulombs (C)

Question 2

when two materials are rubbing against each other , what is it charging by

Answer 2

charging by friction

Question 3

if there is a charged object brought near a neutral object, what charging is it

Answer 3

charging by induction

Question 4

when two materials are rubbed together which material will electrons transfer to

Answer 4

the material with the most affinity for electrons

Question 5

describe function of van de graff generator

Answer 5

all of the positive charges on the dome wan to repel each other but cannot move. they have an electric field around them which attracts electrons. if the voltage is big enough spark can occur. in air you typically need 10000V per cm spark

Question 6

describe uses and dangers of static electricity

Answer 6

photocopier function, spray painting a car, removing pollutants in power stations dangers is lightning producing and causing gases to ignite in the atmosphere

Question 7

what is conventional current

Answer 7

when current is flowing is moving negative charges basically flow of electrons

Question 8

formula for calculating current

Answer 8

I= Q/t
(I) is current measured in ampere (A)
(Q) is charge
(T) is time

Question 9

identify where to place an ammeter

Answer 9

placed in series in circuit

Question 10

what is current

Answer 10

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

Question 11

what is voltage

Answer 11

energe per unit charge

Question 12

formula for calculating voltage

Answer 12

V= E/Q
V= voltage measured in volts and E is energy measured in joules and Q is charge measured in C

Question 13

what is voltmeter

Answer 13

instrument used for measuring potential difference between two points in the circuits. it is a measure of how much energy is being used by each coloumb of charge flowing between two points and is placed in parallel with components to measure its voltage

Question 14

what is resistance and what causes it

Answer 14

is the oppisition to the flow of current in a circuit and measured in ohms. it is caused by vibrating atoms getting in the way this causes collisions between atoms and electrons which induces hear and resists flow of charge

Question 15

what does ohms law state

Answer 15

ohms law states that current in and voltage across a conductor are proportional