# Electricity

what is the law of magnetism
the law is that like charges repel and unlike charges attract
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how are materials charged
materials are charged by friction, and this is when electrons move from one surface to another
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what is static electricity useful for in everyday life
they are useful in photocopiers and inkjet printers.
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what is current measured in
current is measured in amps (A) using an ammeter which has to be wired in series
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what voltage or potential difference measured in
voltage is measured in volts (V), using a voltmeter which has to be wired in parallel
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what is resistance measured in
resistance is measured in ohms
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what is the equation for voltage
voltage = current x resistance (V=IR)
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what happens when you increase the resistance
when you increase the resistance it causes the current to decrease for a given voltage
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what happens when resistors are in series
R total = R1 + R2 + R3
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current and potential difference in circuits the current is the same around the whole circuit but the potential difference may
the current is the same around the whole circuit but the potential difference may vary in series circuits
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current and potential difference in circuits
in parallel circuits the voltage is the same but the current may vary across different components
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what is the role of the diode in a circuit
only allow the current to pass in one direction
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what happens to a light dependent resistor as that light level increases
as the light level increases that LDR decreases
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what is a metals charge carried by
they are carried by electrons
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what is charge measured in
charge is measured in Coulomb (C)
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what happen to the resistance of the thermistor as the temperature increases
the resistance of a themistor decreases as the temperature increases
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what is current
current is the rate of flow if charge
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what is the equation for charge
charge = current x time (Q = IT)
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what is the equation for electrical power
electrical power = current x voltage (P=IV)
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what happens when P=IV and V=IR combine
P=I2R
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what is the equation for energy transferred
energy transferred= current x voltage x time
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what is alternating current
alternating current is current that is changing direction, 100 times per second
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which way does direct current flow in
direct current flows in one direction
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what current is mains supply, what current is in cells and batteries
mains electricity is in alternating current, whilst cells and batteries supply direct current.
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what is the national grid
the national grid is a system of cables and transformers linking power stations to consumers
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what do charged object do
they create an electric field around itself. the electric field is strongest close to the charged object. the further away from the charged object, the weaker the field
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what happens to the second charged object
it experiences a force. the force gets stronger as the distance between the object decreases
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## Other cards in this set

### Card 2

#### Front

how are materials charged

#### Back

materials are charged by friction, and this is when electrons move from one surface to another

### Card 3

#### Front

what is static electricity useful for in everyday life

### Card 4

#### Front

what is current measured in

### Card 5

#### Front

what voltage or potential difference measured in