electricity

studied byStudied by 5 people
5.0(1)
Get a hint
Hint

AC current

1 / 37

flashcard set

Earn XP

Description and Tags

38 Terms

1

AC current

changes direction and instantaneous value with time

New cards
2

EMF

the energy supplied to each coulomb of charge passing through the battery.

New cards
3

Lost volts

The potential difference across the internal resistor of a source of e.m.f.

New cards
4

Internal resistance

resistance inside the source of electrical energy.

New cards
5

terminal potential difference (t.p.d.)

Voltage that appears across the terminals of a source when the source is supplying a current to a circuit. It is the potential difference that appears in the circuit.

New cards
6

short circuit

A connection that allows current to take the path of least resistance

New cards
7

open circuit

an incomplete electrical circuit in which no current flows

New cards
8

Information from a Vtpd vs Current Graph.

Y Intercept - EMF

X Intercept - Short Circuit Current

Gradient = -r

New cards
9

1 Farad

1 coulomb of charge stored per unit volt

New cards
10

Capacitance (C)

Measured in Farads (F)

New cards
11

Charge (Q)

Measured in Coulombs (C)

New cards
12

Area under a Q vs V graph.

Energy Stored in a capacitor.

New cards
13

Voltage vs Time for Charging Capacitor

<p></p>
New cards
14

Current vs Time for Charging Capacitor

<p></p>
New cards
15

Voltage vs Time for Discharging Capacitor

<p></p>
New cards
16

Current vs Time for discharging Capacitor

<p></p>
New cards
17

Adding a resistor in series to an internal resistance circuit.

Resistance increases.

Current decreases.

Lost volts decrease.

VTPD increases

New cards
18

Removing a resistor from a internal resistance circuit. Or adding in parallel.

Resistance decreases

Current increases

Lost volts increase

VTPD decreases

New cards
19

Capacitor/Resistance Circuit - What happens when you increase resistance?

Initial Current reduces.

Longer time to charge.

New cards
20

Capacitor/Resistance Circuit - What happens when you increase capacitance?

Longer time to charge.

Same final voltage.

New cards
21

conduction band

A band higher in energy than the fully occupied valence band. Will have electrons free to move in this energy band.

New cards
22

valence band

The highest energy band that is fully occupied.

New cards
23

For conduction to occur you need

Free electrons, accessible empty states

New cards
24

Conductivity increases with temperature increasing

Semiconductor

New cards
25

Conductivity decreases with temperature increasing.

Conductor

New cards
26

Has partially filled valence and conduction bands.

Metals (Conductors).

New cards
27

Has a filled valence band.

Insulators.

New cards
28

At room temperature there is enough energy to move electrons from valence to conduction band.

Semiconductor.

New cards
29

Term to describe adding impurities to semiconductor.

Doping

New cards
30

Why are semiconductors doped?

To increase conductivity.

New cards
31

Negative terminal connected to N-Type

Positive terminal connected to P-Type

Forward bias

New cards
32

Positive terminal connected to N-Type

Negative terminal connected to P-Type

Reverse bias

New cards
33

Forward bias does what to the depletion layer?

Makes it smaller, reduces electric field

New cards
34

Reverse bias does what to the depletion layer?

Makes it larger, increases electric field

New cards
35

For an LED to light it needs to be in ...

Forward Bias

New cards
36

For a solar cell to produce electricity it needs to be ...

Unbias

New cards
37

When the LED is forward bias it works because ....

Voltage applied causes electron from the conduction band of the n type to move towards the conduction band of p type. Electrons fall from the conduction band to valence band, photon emitted.

New cards
38

A solar cell works because...

Electrons gain/absorb energy from photons/light, electrons move form valence band to conduction band. Electrons move towards n-type semiconductor (producing a P.D.)

New cards

Explore top notes

note Note
studied byStudied by 33 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 19 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 2 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 18 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 5 people
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 1 person
Updated ... ago
5.0 Stars(1)
note Note
studied byStudied by 99 people
Updated ... ago
5.0 Stars(2)
note Note
studied byStudied by 2412 people
Updated ... ago
5.0 Stars(3)

Explore top flashcards

flashcards Flashcard36 terms
studied byStudied by 10 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard54 terms
studied byStudied by 5 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard33 terms
studied byStudied by 37 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard22 terms
studied byStudied by 12 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard31 terms
studied byStudied by 3 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard35 terms
studied byStudied by 39 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard32 terms
studied byStudied by 4 people
Updated ... ago
5.0 Stars(1)
flashcards Flashcard34 terms
studied byStudied by 50 people
Updated ... ago
5.0 Stars(1)