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Key Stage 3 Science

What is a series circuit? Contain only one loop and the current is the same
What is a parallel circuit? Have branches and the currents in all the branches add up to make the total current
Draw a series circuit with 1 battery, 1 switch, 1 bulb and an ammeter
Draw a parallel circuit with 2 bulbs and a battery
What is current and what is its unit and give its symbol? Current is the flow of electrons. It is measured in amps (A)
What can be used to measure current in a circuit? An ammeter
If the number of bulbs in a series circuit is increased, why does their brightness decrease? Their brightness will decreases because the current decreases
What happens to the current if the voltage is increased? The current will also increase
What is an electric cell? A cell gives the electrons energy
What is voltage? How much energy each electron has
What are the units of voltage? Volts (V)
How must a voltmeter be connected in order to measure the voltage across a component? In parallel
What is resistance? A way of saying how difficult it is for electricity to flow through something
What is a fuse? The fuse breaks the circuit if a fault in an appliance causes too much current to flow.
What are the two factors that affect the resistance of a wire 1.The thickness of the wire 2. The length of the wire
What happens to the current if the thickness of the wire is increased? It will increase
What happens to the current if the length of the wire is increased? It will decrease
True/False? In a series circuit, the current is the same everywhere TRUE
If the number of bulbs in a series circuit is increased, why does their brightness decrease? Their brightness will decreases because the current decreases
What happens to the current if the voltage is increased? The current will also increase
In an electric cable, what are the colours of the following wires 1.Neutral 2.Live 3.Green-yellow stripes 1.Blue 2. Brown 3. Earth
What happens to the current at junctions in a parallel circuit? The current splits
What are the units of voltage? Volts (V)
How must a voltmeter be connected in order to measure the voltage across a component? In parallel
Define "current" Flow of charge
Define "potential difference" (or "voltage") Energy carried by the flow of electrical charge
State the units of current Ampere (Amp)
State the units of potential difference Volt (V)
Define "series" circuit Components in a circuit are all in one loop
Define "parallel" circuit Components in a circuit are in separate loops
Define "resistance" Slows down the flow of electricity
State the units of resistance Ohms
State the equation used to calculate resistance R=V/I, Resistance= potential difference/current
State the equation used to calculate electrical power P=IV, Power=current x potential difference
What two things are needed for an electric current to flow something to transfer energy to electrons (battery), a complete path for the electrons to flow (circuit)
State the rule for current in a series circuit The current is the same at every point in the circuit and in every component
State the rule for potential difference in a series circuit The total potential difference of the power supply is shared between components
State the rule for resistance in a series circuit the more resistors, the greater the resistance. RT=R1+R2
State the rule for current in a parallel circuit The total current through the whole circuit is the sum of the currents through the separate components
State the rule for potential difference in a parallel circuit The potential difference across each branch in the circuit is the same
State the rule for resistance in a parallel circuit Adding more resistors in parallel decreases resistance
What is an electrical conductor? a material that allows charge to move easily through it
What is an electrical insulator? material that does not allow charge or heat to pass through it easily
Compare resistance in electrical conductors and insulators electrical conductor = low resistance, electrical insulator = high resistance
How can you investigate how easily a material conducts electricity? set up a series circuit with a cell, lamp, wires > place material in between two wires > lamp on = conductor
Give some examples conductors metal elements, graphite, mixtures of metal, salt solution, liquid calcium chloride
Give some examples insulators most non-metal elements (e.g., sulphur, oxygen), diamond, plastic, wood, rock

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