Provides EMF (potential difference) Collection of cells

Allows current to flow in one direction When going forward=less resistance Other direction=More resistance

Electricity Flashcards by Enoch Akinwunmi-taylor

Earthing

Definition

Connecting the charged body to the earth via a conductor

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Uses of static electricity

List (3)

Spray-painting
Printers
Photocopiers

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Static electricity

Definition

Charge that cannot move

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Current

Definition

The rate of flow of charge

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Charge

Equation

Current x Time

Q=IT

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Open Switch

Definition

Stops current from flowing

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Closed Switch

Definition

Allow current to flow

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Cell

Definition

Source of EMF (potential difference)

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Battery

Defintion

Provides EMF (potential difference)
Collection of cells

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Diode

Definition

Allows current to flow in one direction

* When going forward=less resistance
* Other direction=More resistance

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Resistor

Definition

Limits current by providing a set resistance in a circuit

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Variable resistor

Definition

A resistor that can change its resistance

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LED

Definition

A diode that emits light

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Bulb

Definition

Converts electrical energy into light and heat energy

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Fuse

Definition

Reduces current output for safety by melting if current gets too high

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Voltmeter

Definition

Measures potential difference

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Ammeter

Definition

Measures current

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Thermistor

Definition

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Decreases resistance as temperature increases
Resistance changes in response to temperature

LDR

Definition

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Resistance changes in response to light

Series circuit

Definition

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Only one path for current to flow through

Parallel circut

Definition

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More than one path for current to flow through

Energy

Electricity 1

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Charge x Potential difference

E=QV

Potential Difference

Definition

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The amount of electrical energy transferred per unit of charge

Potential Difference

Equation

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Current x Resistance

V=IR

Resistor | Practical Summary

The graph should be a straight line through the origin

Filament Bulb | Practical Summary

The graph sould be an S-shape

Diode | Practical Summary

The graph is flat on 0 when in the negatives, but then curves up in the positives

Rules for a Parallel Circuit | List (2)

1. The potential difference across each branch is the same 2. The total current in the main circuit is the sum of the current through the components

Alternating Current | Definition

Current that oscilates back and forth/ changes direction

Potential Difference of Mains Electricity

230V

Frequency of Mains Electricity

50Hz

Direct Current | Definition

Current that only flows in one direction

Frequency | Equation

1/time for one wave | F=1/T

Amplitude of Signal | Equation

Y-gain setting x Amplitude(cm)

Tine for one wave | Equation

time base setting x wavelength(cm)

Earth Wire | List (2)

* Green and Yellow * Safety wire to stop appliance from going live

Neutral wire | List (2)

* Blue * Stays as close to 0V with respect to earth

Live wire | List (2)

* Brown * Alternates between positive and negative potential difference with respect to neutral

Why do plugs have fuses?

If there is a high current, the fuse gets hot and melts, breaking the circuit and stopping any more current from flowing

RCCB

Residual Current Circuit Breaker

Step-up transformers | Use (2)

* Used at power stations to transfer electricity to the National Grid * Used to make the size of the alternating potential difference much bigger, so the current is smaller

Step-down transformers | Use (1)

Used to supply electricity from the National Grid to consumers

Power | Equations (3)

1. Energy transferred/ time *P=E/T* 2. Current x p.d *P=IV* 3. current ^ x resistance *P=I^R*

Electricity Flashcards

(43 cards)