P4 Electric circuits
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1
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What is this symbol in a circuit diagram?
An open switch
2
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What is this symbol in a circuit diagram?
A closed switch
3
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What is this symbol in a circuit diagram?
A cell
4
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What is this symbol in a circuit diagram?
A battery
5
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What is this symbol in a circuit diagram?
A diode
6
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What is this symbol in a circuit diagram?
A resistor
7
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What is this symbol in a circuit diagram?
A variable resistor
8
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What is this symbol in a circuit diagram?
An LED
9
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What is this symbol in a circuit diagram?
A lamp
10
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What is this symbol in a circuit diagram?
A fuse
11
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What is this symbol in a circuit diagram?
A voltmeter
12
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What is this symbol in a circuit diagram?
An ammeter
13
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What is this symbol in a circuit diagram?
A thermistor
14
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What is this symbol in a circuit diagram?
An LDR
15
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What is electric current?
The flow of electric charge round the circuit
16
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What is needed for a current to flow around a complete circuit?
A potential difference
17
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In a series circuit what is the value of current anywhere in the circuit?
The same
18
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What is potential difference?
The driving force that pushes the charge round
19
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What is resistance in a circuit?
Anything that slows the flow down
20
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What does the current flowing through a component depend on?
The potential difference across the component and the resistance of the component
21
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What is the charge equation?
Charge (C) = Current (A) x Time (s)
22
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True or false: The greater resistance across a component, the smaller the current that glows through it
True
23
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What is the equation for potential difference?
Potential difference (V) = current (A) x resistance (ohms)
24
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The current though an ohmic conductor is…
directly proportional to the potential difference across the resistor the resistance remains constant as the current changes)
25
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The resistance is not constant at…
lamps, diodes, thermistors, LDRs
26
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What happens to the resistance of a filament lamp as the temperature increases?
The resistance of a filament lamp increases as the temperature of the filament increases.
27
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How does the current flow at a a diode?
The current through a diode only flows in one direction.
28
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The diode has a very high resistance in which direction?
The reverse direction
29
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What is an LDR?
A light-dependent resistor), used to detect light levels
30
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What happens to an LDRs resistance as light intensity increases?
Resistance decreases
31
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What is a thermistor in a circuit?
used as temperature sensors, as temperature increases, resistance decreases
32
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What is a diode?
A device that allows current to flow in one direction but not the reverse direction
33
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What are the series circuits rules?
There is the same current through each component (everywhere)
Cell p.d’s add up
The p.d. of the power supply is shared between the components
The total resistance of two components is the sum of the resistance in each component (R total = R1 + R)
Cell p.d’s add up
The p.d. of the power supply is shared between the components
The total resistance of two components is the sum of the resistance in each component (R total = R1 + R)
34
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what are the parallel circuits rules?
The p.d. across each component is the same
The total current through the circuit is the sum of the currents through the operate components
The total resistance of two resistors is less than the resistance of the smallest individual resistor
The total current through the circuit is the sum of the currents through the operate components
The total resistance of two resistors is less than the resistance of the smallest individual resistor
35
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How does static charge work?
When certain insulating materials are rubbed against each other they become electrically charged,
Negatively charged electrons are rubbed off one material and onto the other,
The material that gains electrons becomes negatively charged,
The material that loses electrons is left with an equal positive charge
Negatively charged electrons are rubbed off one material and onto the other,
The material that gains electrons becomes negatively charged,
The material that loses electrons is left with an equal positive charge
36
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What happens to two objects that carry the same types of charge?
They repel each other
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What happens to two objects that carry different types of charge?
they attract each other
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What are attractions and repulsion between objects examples of?
Non-contact forces
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What does a charge object create around itself?
An electric field
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Where is the electric field strongest?
Close to the charged object
41
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What happens if you place a second object in an objects electric field?
The second object experiences a force, the force gets stronger as the distance between the objects decreases
42
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What is ohms law?
The current through a resistor at a constant temperature is directly proportional to the potential difference across the resistor
43
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Define static electricity
Electric charge stored on insulated objects
Note 
Flashcards (30)