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GCSE Revision > Physics - ELECRICITY & CIRCUITS > Flashcards

Physics - ELECRICITY & CIRCUITS Flashcards

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1
Q

What is current?

A

The flow of charge around a circuit.

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2
Q

What is current measured in?

A

Amps (A) / Ammeters are connected in series.

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3
Q

What is potential difference?

A

A measure of the energy given to the charge carriers in a circuit.

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4
Q

What is potential difference measured in?

A

Volts (V) / Voltmeters are connected in parallel.

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5
Q

What is resistance?

A

A measure of how hard it is for electricity to pass through a component.

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6
Q

What is resistance measured in?

A

Ohms (Ω)

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7
Q

What is a series circuit?

A

A series circuit has components arranged one after the other along the same route.

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8
Q

What is a parallel circuit?

A

A parallel circuit has two or more paths for current to flow through.

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9
Q

What makes a circuit incomplete?

A

An incomplete circuit is a circuit that does not have a complete path for electricity to flow.

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10
Q

Thermistor

A

A thermistor is a component where resistance changes with its temperature. Usually, increasing temperature decreases the resistance. We can use a thermistor to turn a heater off when a house reaches certain temperatures.

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11
Q

Diode

A

A diode is a circuit component that only allows current to flow in one direction.

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12
Q

Fuse

A

A fuse breaks the circuit if a fault in an appliance causes too much current to flow.

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13
Q

LED (light emitting diode)

A

Light can be produced in different ways; a light-emitting diode (LED) close light-emitting diode (LED)Light-emitting diodes (LEDs) glow when current passes through them. is the most common component used for producing light.

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14
Q

LDR (light dependent resistor)

A

An LDR, or Light Dependent Resistor, is a resistor that changes its resistance based on the amount of light it is exposed to. They are commonly used in light sensors, such as automatic lighting systems and cameras.

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15
Q

Resistor

A

A resistor is an electrical component that is used to control the flow of electric current in a circuit.

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16
Q

Variable resistor

A

A variable resistor is used in some dimmer switches and volume controls. As the slider moves towards B the length of wire in the circuit increases. This increases the resistance in the circuit and decreases the current.

17
Q

In which direction does current flow in a circuit?

A

Current flows from positive to negative and electron flows from negative to positive. Current is determined by the number of electrons passing through a cross-section of a conductor in one second.

GCSE Revision (14 decks)

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