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Electricity Flashcards

(58 cards)

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1
Q

What is current

A

The rate at which an electric charge passes a point in a circuit

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2
Q

What do you need for current to flow

A
  1. A complete circuit 2. A cell, battery, or power supply
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3
Q

Name 3 tools to measure current

A
  1. Analouge meter 2.Digital meter 3. Galavameter
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4
Q

What is an ammeter

A

An ameter is used to measure current

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5
Q

What unit of measurement an ammeter use

A

Amperes

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6
Q

What type of circuit is an ammeter connected to

A

Series

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7
Q

What is the formula to measure current

A

Current(a) = Charge(coloumbs)/Time(s), Q(Charge)=I(Current) T(seconds), Q=IT

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8
Q

A current of 150mA flows for 1 minute. What is the charge?

A

9C

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9
Q

What is the definition of voltage?

A

The difference in elecrtical potential between 2 points, or How much work is done to move one coloumb of charge.

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10
Q

What is used to measure voltage

A

Voltemeter

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11
Q

What is the unit for voltage?

A

Volt

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12
Q

What circuit is the voltmeter connected to?

A

Parallel circuit

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13
Q

What is EMF

A

Electromagnetic Force

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14
Q

What is the definition of EMF

A

The energy provided by a source to move electrons through a circuit

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15
Q

What is the EMF of two batteries with the voltage of 1.5

A

3.0 Volts

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16
Q

What happens if a battery is connected in reverse?

A

It cancels out

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17
Q

What is the formula to calculate Voltage?

A

Voltage= Work done(W)/ Coloumbs(Q), V=W/Q, V=Jules/Charge OR V=IR

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18
Q

A battery that gives 60J of energy to a charge of 5C, work out the voltage

A

V=W/Q
=60/5
=12V

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19
Q

A circuit has a voltage of 12V within 10 seconds and a current of 2 amperes. Calculate the work done

A

V=W/Q
Q=IT
Q=2 X 10
Q=20

V=W/Q
12=W/20
w=240j

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20
Q

What is the definition of resistance?

A

A measure of how difficult it is for an electric current to flow through a devices

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21
Q

What is the resitor symbol

A

-[ ]- (Not accurate)

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22
Q

What happens to the current if there is more resistance in a circuit

A

The less the current

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23
Q

What is the formula for resistance?

A

R=V/I
V- voltage
I- Current
R-Resistance

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24
Q

Calculate the resistance of a circuit with the current of 0.02A and a voltage of 10.0V

Study These Flashcards
A

R=V/I
=10/0.02
=500

25
What is potential difference?
Potential difference is voltage (define voltage)
26
What happens to a current when a voltage increases
WHne voltage increases, current increase
27
WHat is an Ohmic Resistor
A resistor where regardless the voltage increase, the voltage will remain the same. Coonstant resistance
28
What is a Non-Ohmic Resistor
A resistor which changes with the current or voltage of a circuit
29
Name and explain 2 factors of resistance
1) Length-The longer the wire th e greater the resistance 2) Diameter -The thiker the wire the less the resistance. Halving the wire, doubles the resistance
30
What are Watts
The rate at which energy is used or transferred. Watts are power Jules per second
31
What is the formula to measure power
P=VI P-Power V-voltage I-Current
32
What is the formula to calculate energy
E=VIT E-Energy V-Voltage I-Curent T-Time
33
What is the formula to calculate energy transferred
E(KWH)=P(KW) X TIME
34
What happends to the current when resistence decreases
The current will increase
35
What is a LDR
An LDR (Light Dependent Resistor) is a resistor whose resistance changes based on the light it receives. The more the light then the less the resistance
36
What is a thermistor
A thermistor is a type of resistor whose resistance changes with temperature. The higher the temperature = the lower the resistance
37
What are relays
a switch that is controlled by elctorcromagnets and is used with 2 complete circuits
38
What is a variable resitor
A resistor where resistance can be changed
39
When is a relay used
Relay is needed qhwn the circuit has a large voltage
40
How does an LDR work
Light has protons, and these protons energize the electrons,s making the current flow faster
41
What is a diode
A diode allows electric current ot flow in one direction
42
What is a LED
An LED is a diode that emits light when a current flows through it
43
How do you calculate resistance in a series
Theresistance is sumf of the resistance
44
How does voltage work in a series circuit
In a sereis circuit the voltage is shared across the circuit
45
How does voltage work in a parralel circuit
Voltage is the same throughout each component
46
How do you calculate resistance in a parallel circuit
1/R=1/R1 + 1/R2
47
Hod do you calculate current in a parallel and series circuit
I=I1+I2
48
WHat is a analogue circuit
It is a circuit that allows voltages to be in a certain range
49
What is a digital circuit
Voltages have one of two values, high (on) or low(0)
50
What is a logic gate
Logic gates are switching circuits
51
What is the truth table
The truth table is a table that shows the outputs for all possible inputs
52
When are logic gates used
As processes in electric control systems
53
Name and explain one use of a logic gate
Security systems used the And gate. If multiple sensors are on then alarm goes on
54
What do digital meters do
They display their readings as digits
55
What does an analogue meter do
Displays their reading on a continuas scale
56
What is a potential divider
A part of a circuit consisting of 2 resistors connected in series
57
What is the use of a potential divider
It helps control voltage in a circuit
58
What is the formula for potential dividers
V1/V2=R1/R2

Physics (6 decks)

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