Studied by 84 people

5.0(1)

Get a hint

Hint

1

Current

The continuous flow of charge

New cards

2

Average current

*Iavg = change in charge/ change in time*

New cards

3

Battery

A battery is a device that maintains an electric potential difference between the two terminals.

New cards

4

Direct current

The flow is from higher potential to lower potential. The electricity also flows in that direction called direct current.

New cards

5

Resistance

It is the impedance to the flow of electricity through a material. Asa charge moves through a material, it eventually hits a non-moving nucleus in the material.

New cards

6

Resistivity

It can be thought of as the density of nuclei the electrons may strike.

*R = ρ l / A*

R = resistance of the circuit

ρ = resistivity

l = length

A = cross-sectional area

New cards

7

low resistivity

conductors

New cards

8

high resistivity

insulators

New cards

9

resistors in series

R eq = R1 + R2

New cards

10

resistors in parallel

1/Req = 1/R1 + 1/R2

New cards

11

Ammeter

An ammeter is a device with a very low resistance that measures the current.

New cards

12

Voltmeter

It measures the electric potential called potential drop.

New cards

13

Ohm’s Law

*V = IR*

R is the resistance in the circuit.

V is the potential difference in the circuit

I is the electric current

New cards

14

Power dissipation

*P = VIP = I^2 RP = V^2 IR*

P is the power

V is the potential difference in the circuit.

I is the electric current.

New cards

15

Kirchhoff’s rules

The loop rule states that the voltage drop across any complete loop in the circuit is 0V.

This statement follows from the conservation of energy when applied to circuits.

The junction rule states that the sum of all current flowing into any junction is equal to the current flowing out of the junction.

This statement follows from the conservation of charge.

New cards

16

Capacitance

*C = QV*

C = refers to the capacitance that we measure in farads

Q = refers to the equal charge that we measure in coulombs

V = refers to the voltage that we measure in volts

Besides, there is another formula that appears like this:

*C = kε0Ad*C = refers to the capacitance

K = refers to the relative permittivity

ε0 = refers to the permittivity of free space

A = refers to the surface area of the plates

d = refers to the distance between places measured

New cards

17

Capacitors in parallel

Cp = C1 + C2

New cards

18

Capacitors in series

1/Cs = 1/C1 + 1/C2

New cards

19

Name three possible energy sources for a circuit

Battery

Photoelectric cell

Generator

New cards

20

A circuit is opened and closed using a:

Switch

New cards

21

What will happen to the charges in a circuit when a switch is closed?

The charges will flow through the circuit.

New cards

22

What will happen to the charges in a circuit when a switch is open?

The circuit is broken and the charges stop flowing through the circuit.

New cards

23

What is the standard voltage per branch in a home in the United States?

120 V

New cards

24

A switch that automatically opens if the current is too high is a ________________

Circuit Breaker

New cards

25

The symbol used to represent resistance in a schematic diagram is

a zigzag line

New cards

26

A closed circuit is a circuit in which charge

can flow

New cards

27

When two light bulbs are connected in series, the

same amount of current always flows through each bulb

New cards

28

When resistors are put in parallel with each other their overall resistance is

smaller than the resistance of any of the resistors

New cards

29

As more lamps are put into a series circuit, the overall current in the circuit

decreases

New cards

30

As more lamps are put into a parallel circuit, the overall current in the circuit

increases

New cards

31

When one light bulb in a parallel circuit containing several light bulbs burns out, the other light bulbs

burn the same as before

New cards

32

Electrical devices in our homes are connected in

parallel

New cards