Chapter 18.1 Physics

Question 1

What’s a schematic diagram?

Answer 1

A diagram that depicts the construction of an electrical apparatus

Question 2

What does the filament of the light bulb act as?

Answer 2

A resistor

Question 3

What is an electric circuit composed of?

Answer 3

A bulb, a battery, a switch, and a wire

Question 4

What is an electric circuit?

Answer 4

It’s a path through which charges can flow

Question 5

What is a schematic diagram for a circuit sometimes called?

Answer 5

A circuit diagram

Question 6

What do you call any element or grouup of elements in a circuit that dissipates/uses energy?

Answer 6

A load

Question 7

What is a simple circuit consisted of?

Answer 7

A source of potential difference and electrical energy, such as a a battery, and a load, such as a bulb or a group of bulbs

Question 8

What are things that we won’t consider as a load?

Answer 8

The wire and the switch, because they have negligible resistance

Question 9

Where does the potential difference exist?

Answer 9

In the path from one terminal to the other.

(And electrons move throughout too!)

Question 10

What is a closed circuit?

Answer 10

A circuit that has a closed loop path for electrons to follow.

Question 11

What does a short circuit happen?

Answer 11

When there’s no load to dissipate the charges in a circuit.

There is an increase in current, and the wires might heat up

and melt or even cause a fire

Question 12

What is the circuit’s EMF?

Answer 12

The source of potential difference and electrical energy of the circuit

Question 13

What is voltage?

Answer 13

It’s the difference in electric potential energy between two points in an electric field. It represents the work needed to move a unit positive charge from one point to another.

Question 14

What’s a source of emf, or electromotive source?

Answer 14

Any device that increases the potential energy of charges in a circuit is a source of electromotive force

Question 15

What is the emf in mathematical terms?

Answer 15

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

Think of it as a charge pump that forces electrons to move in

a certain direction

Question 16

What’s conventional current?

Answer 16

Conventional current flows from the positive terminal to the negative terminal of a power source.

Despite the actual charge carriers in most circuits being negatively charged electrons, which flow from the negative terminal to the positive terminal of a power source, conventional current is defined to flow in the opposite direction.

Question 17

Compare the terminal voltage and emf in conventional current.

Answer 17

The terminal voltage is less than the emf, because of the slight resistance that occurs in the battery because of the clashing of electrons/charges

Although we’ll disregard that internal resistance

Question 18

Potential difference across the load…

in series

Answer 18

equals the terminal voltage

Question 19

If the potential energy across a light bulb is 3V, what is the sum of potential energy from all of the batteries powering it?

Answer 19

3V

Question 20

In what forms is electrical energy dissipated in light bulbs?

Answer 20

Light energy, and heat energy