Unit 5 & 10

Question 1

one Coulomb

Answer 1

the charge transported by a current of one ampere in one second

Question 2

Electric field

Answer 2

a region where a charged object experiences a force.

Question 3

Electric field strength

Answer 3

the force per unit charge experienced by a small positive point charge placed at that point.

Question 4

Coulomb’s Law

Answer 4

The force between two point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between their centers. The direction of the force is along the line connecting the two charges.

Question 5

Current

Answer 5

the rate of flow of charge.

Question 6

Direct Current

Answer 6

current that flows in just one direction.

Question 7

Potential Difference

Answer 7

the energy transferred from one coulomb of charge moving between two points in a circuit.

Question 8

Electromotive force

Answer 8

the energy transferred to electrical energy per coulomb of charge.

Question 9

Electron Volt

Answer 9

the energy transferred to an electron when it moves through a potential difference of one volt = 1.6*10^-19 J

Question 10

Kirchoff’s first law

Answer 10

the sum of the current into a junction equals the sum of the currents away from a junction.

Question 11

Kirchoff’s second law

Answer 11

in a complete circuit loop, the sum of the EMFs in the loop is equal to the sum of the potential differences in a loop.

Question 12

Ohm’s law

Answer 12

the PD across a metallic conductor is directly proportional to the current in the conductor providing that the physical conditions of the conductor do not change.

Question 13

Primary Cell

Answer 13

an electric cell that produces current by an irreversible chemical reaction.

Question 14

Secondary Cell

Answer 14

a rechargeable electric cell that converts chemical energy into electrical energy by a reversible chemical reaction.

Question 15

The capacity of a cell

Answer 15

a measure of the ability of a a cell to release charge = the constant (ish) current * the time it can supply this for.

Question 16

Flemmings left-hand rule

Answer 16

Thumb = movement
First finger = field
Second finger = current
(mother fucking cunt)

Question 17

Right-hand rule

Answer 17

Fingers = field
Thum = current

Question 18

Gravitational field

Answer 18

a region of space where a massive object experiences a force.

Question 19

Electrostatic field

Answer 19

a region of space where a charged object experiences a force.

Question 20

Electric potential

Answer 20

the work done per unit charge in moving a small unit positive test charge from infinity to that point.

Question 21

Gravitational Potential

Answer 21

the work done per unit mass in moving a small test mass from infinity to that point.

Question 22

Newton’s Law of Gravitation

Answer 22

the force of attraction between two massive objects is proportional to the product of the masses and inversely proportional to the square of their separation.

Question 23

Field Line

Answer 23

A line used to show the direction of a field. (for electric field it shows the direction a positive charge would move)

Question 24

Equipotential Surface

Answer 24

A surface of constant potential. The work done to move a charge from any point on the equipotential surface to any other point on the equipotential surface is zero since they are at the same potential.

Question 25

Electric Potential Energy

Answer 25

Energy a charged object possesses because of its position in an electric field

Question 26

Gravitational Potential Energy

Answer 26

Energy a massive object possesses because of its position in a gravitational field

Question 27

Potential Gradient

Answer 27

The change in potential divided by the distance over which the change happens.

Question 28

Potential Difference

Answer 28

the difference of electrical potential between two points.

Question 29

Escape Velocity

Answer 29

the lowest velocity which a body must have in order to escape the gravitational attraction of a particular planet or other objects.

Question 30

Geosynchronous orbit

Answer 30

an orbit with a time period of 24 hours so the satellite appears to stay in the same region of the sky

Question 31

Polar orbit

Answer 31

an orbit close to the Earth’s surface that often goes over the poles

Question 32

Geostationary orbit

Answer 32

a special case of the geosynchronous orbit where the satellite orbits around the equator so will be stationary relative to the Earth.

Question 33

Orbital energy

Answer 33

The sum of the potential and kinetic energies of an object in orbit

Question 34

Uniform Field

Answer 34

A field where the electric field strength is constant throughout the field.

Question 35

Radial Field

Answer 35

A field that is drawn from a central point and becomes weaker as the distance from the point increases.