Unit 15AB applied science complete
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Najah Bendriss BTEC Applied Science Physics Unit 15 A & B
Unit 15 A & B: Circuits.
Component Definition Symbol
Cell Source of electrical
energy and is used to
push electrons around a
circuit.
Battery Several connected cells
also used to push
electrons around a
circuit.
Switch Enables the current in
the circuit to be
switched on and off.
Filament lamp Lights up when current
passes, used to indicate
when current is flowing
through a circuit.
Fixed resistor Used to reduce the flow
of current in a circuit.
Thermistor Used to indicate
temperature changes in
a circuit, as the
temperature increases
the resistance of the
thermistor decreases.
Light emitting diode Emits light when current
(LED) passes through.
Light-dependent Is a component, its
resistor (LDR) resistance depends on
the amount of light
falling on it.
1
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Najah Bendriss BTEC Applied Science Physics Unit 15 A & B
Rheostat Used to control the flow
of current without
changing the resistance.
Capacitor Is a non-resistant
electronic component
that stores energy in the
form of electrostatic
field.
Voltmeter Measures potential
difference across a
component in a circuit.
Ammeter Measures current in a
circuit.
Electrical unit Definition Symbol Unit of
measurement
Current Rate of flow of I Ampere
electrical charge
Potential difference The difference of V Volt
electrical potential
between two points.
Electrical charge Collection of Q Coulomb
electrons
Resistance When a charge Ω Ohm
moves through a
potential difference,
electrical work is
done, and energy
transferred.
V = IR
Conductance The ability of an G Siemen
object to allow
electric current to
flow through it.
2
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assignment
written by
najbo123
www.stuvia.com
Downloaded by: najbo123 | Want to earn £756
Distribution of this document is illegal extra per year?
, Stuvia.co.uk - The Marketplace for Revision Notes & Study Guides
Najah Bendriss BTEC Applied Science Physics Unit 15 A & B
Unit 15 A & B: Circuits.
Component Definition Symbol
Cell Source of electrical
energy and is used to
push electrons around a
circuit.
Battery Several connected cells
also used to push
electrons around a
circuit.
Switch Enables the current in
the circuit to be
switched on and off.
Filament lamp Lights up when current
passes, used to indicate
when current is flowing
through a circuit.
Fixed resistor Used to reduce the flow
of current in a circuit.
Thermistor Used to indicate
temperature changes in
a circuit, as the
temperature increases
the resistance of the
thermistor decreases.
Light emitting diode Emits light when current
(LED) passes through.
Light-dependent Is a component, its
resistor (LDR) resistance depends on
the amount of light
falling on it.
1
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, Stuvia.co.uk - The Marketplace for Revision Notes & Study Guides
Najah Bendriss BTEC Applied Science Physics Unit 15 A & B
Rheostat Used to control the flow
of current without
changing the resistance.
Capacitor Is a non-resistant
electronic component
that stores energy in the
form of electrostatic
field.
Voltmeter Measures potential
difference across a
component in a circuit.
Ammeter Measures current in a
circuit.
Electrical unit Definition Symbol Unit of
measurement
Current Rate of flow of I Ampere
electrical charge
Potential difference The difference of V Volt
electrical potential
between two points.
Electrical charge Collection of Q Coulomb
electrons
Resistance When a charge Ω Ohm
moves through a
potential difference,
electrical work is
done, and energy
transferred.
V = IR
Conductance The ability of an G Siemen
object to allow
electric current to
flow through it.
2
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