Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
7j
Key Stage 3 Science
| Question | Answer |
|---|---|
| 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 |
Created by:
Davenant Foundation School
Popular Science sets