Physics Chapter 18

Question 1

What does something have to do in order to be a source of emf?

Answer 1

It has to transform nonelectrical eneergy to electrical emergy.

Question 2

What are examples of sources of emf?

Answer 2

Batteries and generators

Batteries turn chemical energy into electrical energy

Generators turn kinetic energy into electrical energy

Question 3

What is emf?

Answer 3

It’s the source of potential difference (Voltage) and electrical energy

Question 4

What can be determined about the emf and potential difference if resistance isn’t taken into consideration?

Answer 4

The voltage and emf are equal in that case.(across the source’s 2 terminals)

Question 5

What;s the terminal voltage?

Answer 5

It’s the voltage across the battery’s 2 terminals

Question 6

What’s a conventional current?

Answer 6

It’s a circuit in which the current flows from the positive to the negatice sides of the battery.

Question 7

The potential difference across a load equals…

Answer 7

the terminal voltage

Question 7

What can be determined about the emf and terminal voltage in a conventional current?

Answer 7

the terminal voltage is less than the emf

Question 8

What;s a schematic diagram?

Answer 8

It’s an illustration that depicts the construction og electrical aparatus

Question 9

What are the types of energy that a light bulb changed electrical energy to?

Question 10

What does a basic electrical circuit contain?

Answer 10

A light bulb, a switch, and a wire.

Question 11

What is another name for schematic diagram?

Answer 11

A circuit diagram.

Question 12

What’s an electrical circuit?

Answer 12

A set of electrical components connected tsuch that they provide one or more complete paths for the the movement of charges (current).

Question 13

What;s a load?

Answer 13

Any element or group of elements that dissisipates energy.

Question 14

Why don’t we consider the wire or switch as a part of the load?

Answer 14

Because the energy that they dissisipate is negligible

Question 15

What’s a short cirxuit?

Answer 15

It’s a situation where a circuit contains little resistance to the movement of charges..

Question 16

What’s an example of a short circuit?

Answer 16

A wire that has low resistance is connected from one terminal of a battery to the other.

Question 17

What is emf composed of? And what does it stad for?

Answer 17

It’s the source of potential difference and electrical energy in a cricuit.It stands for electromotive force.

Question 18

What does voltage correspond to?

Answer 18

It corresponds to the work needed per unit of charge to move a test charge between the two points.

Question 19

What must a device provide in order to be a source of emf?

Answer 19

It must increase the overall potential energy of charges circulating in a circuit.

Question 20

The emf is…

Answer 20

the energy supplied per unit of charge supplied by a source of electric current

Question 21

How can you think of emf as? And what are some examples?

Answer 21

You can think of it as a charge pump that forces the electrons to move towards a certain direction. Some examples are batteries and geerators.

Question 22

In conventional currents…

Answer 22

the terminal coltage is less than the emf. The reason behind this is becasue the electrons are colliding within the battery while the charges are traveling from one terminal to the other.

Question 23

The potential difference across a load equals…

Answer 23

the terminal voltage

Question 24

How do you calculate the potential difference across a circuit with a light bulb and a battery?

Answer 24

V = IR

Question 25

What types of circuits carry the same current through it’s resistors?

Answer 25

Series

Question 26

What’s the equivalence resisstance?

Answer 26

The total resistance across a circuit.

Question 27

How do you find the equivalence resistance in a series circuit?

Answer 27

The sum of all of the circuit;s resistances .

Question 28

How do you find a circuits total voltage?

Answer 28

V = V1 + V2
or
V = I(R1+ R2)
or
V = ITr()