Circuits

Question 1

Conductors allow for

Answer 1

Electron charges to move more freely

Question 2

What is the function of insulators?

Answer 2

They retard the flow of electricity

Question 3

How do electrons move in conductors?

Answer 3

They move from low potential to high potential

Question 4

Electric current is the

Answer 4

Flow of charge

Question 5

What is the equation of electric current?

Answer 5

I = q / t

Question 6

In a DC current, the charge flows in

Answer 6

One direction

Question 7

In an AC current, the charge flows in

Answer 7

Many directions

Question 8

The direction of current flows

Answer 8

Opposite of electrons, from high to low potential

Question 9

Voltage is the

Answer 9

Change in current

Question 10

What is E, or electromotive force?

Answer 10

Voltage across terminals of a cell when there is no current flowing

Question 11

Electromotive force is basically the potential difference in

Answer 11

Voltage

Question 12

A cell is discharging when

Answer 12

A cell is supplying current

Question 13

How is the current when a cell is discharging?

Answer 13

Going from positive to negative

Question 14

The ∆V equals

Answer 14

V(emf) - IR(cell)

Question 15

What happens when a cell is being recharged?

Answer 15

Current from another source is sent into the positive terminal

Question 16

The cell’s internal resistance is able to

Answer 16

Decrease Voltage

Question 17

What is the equation for Emf?

Answer 17

E = V-IR(int)

Question 18

What is Ohm’s Law?

Answer 18

V = I • R

Question 19

Resistance is the

Answer 19

Opposition to flow of current within the conductor

Question 20

Resistance results in

Answer 20

Energy loss / drop in potential

Question 21

What is the equation for Resistance of conductor?

Answer 21

R = p (resist) • L / A

Question 22

How are most conductors at higher temperatures?

Answer 22

They have greater resistance

Question 23

What is the equation of Power?

Answer 23

P = I • V or V^2 / R or I^2R

Question 24

Kirchhoff states that at any junction,

Answer 24

∑current (in) - ∑current (out)

Question 25

What does Kirchhoff think in regards to voltage?

Answer 25

∑Voltage sources = ∑Voltage drops

Question 26

How does resistance add in a series?

Answer 26

R = R1 + R2 + … + R3

Question 27

How does resistance add in a parallel?

Answer 27

1 / R = 1 / R1 + 1 / R2 + … + 1 / R3

Question 28

Dielectrics function to

Answer 28

Disconnect capacitor from the source of charge, decreasing voltage across

Question 29

What is the function of Capacitors?

Answer 29

They store charge in the circuit based on ∆V between 2 parallel plates

Question 30

What are Capacitors?

Answer 30

A 2-plate system with a positive plate and a negative plate

Question 31

Capacitance is measured with the equation

Answer 31

C = Q / V or E • A / d

Question 32

What is the equation of an electric field?

Answer 32

E = V / d

Question 33

What are dielectrics?

Answer 33

Insulators placed between the plates of capacitor

Question 34

What is the equation for C’?

Answer 34

C’ = k • C

Question 35

Capacitors in parallel are added how?

Answer 35

Cp = C1 + C2 + … + C3

Question 36

Capacitors in series are added how?

Answer 36

1 / Cp = 1 / C1 + 1 / C2 + … + 1 / C3

Question 37

How is the electric field inside a metal?

Answer 37

0

Question 38

What must there be for current to flow through a resistor?

Answer 38

There must be a potential difference