Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
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

Physics

Circuits and Mains Electricity (Section 2)

QuestionAnswer
Current measures the flow of what? Electrons
What equation helps us figure out voltage? Voltage = Current x Resistance (V = I x R)
Assuming the resistance is constant, as we increase the voltage in a circuit, the current will ________________________ increase proportionally
What is unique about the current in dioides? It only flows in one direction
In a filament lamp, as the temperature increases, the _______________ increases resistance
What does a light emitting diode do? - Emit light when current flows through it - Only allow current to flow in one direction
A resistor whose resistance decreases when temperature increases is a _____________ thermistor
The resistance of a thermistor decreases when the temperature _________ and vice versa increases
In a light-dependent resistor, resistance is at its ____________ in bright light and vice versa lowest
What equation helps us figure out charge? Charge = Current x Time (Q = I x T)
Define voltage The energy transferred per unit charge passed
What 3 factors affect resistance? 1. Increasing temperatu
Direct current is supplied by ____________ batteries/cells
Alternating current is supplied by a _____________ mains supply
What do fuses do? Break the circuit when the current gets too high
In a series circuit, the voltage is __________ across each individual component shared
Current is the ______ everywhere in a series circuit same
In a circuit, the total resistance is the _____ of each component's individual resistance sum
Components with a greater resistance will always have a __________ share of the voltage higher
If two batteries each with a p.d. of 1.5V are connected in series, what voltage will they supply between them? 3V
Define current The rate of flow of charge
Define resistance The opposition to a current
Mains supply electricity is ___________ current of _______ V and _____Hz alternating, 230, 50
What colour is a neutral wire? Blue
What colour is an earth wire? Green/Yellow
What colour is a live wire? Brown
What 3 wires are present in plugs? Neutral, live and earth
What are wires made of and what are they coated in an insulating layer of? Made of copper, coated in plastic
What does the neutral wire do? Completes the circuit, allowing current to flow
What does the live wire do? Supplies current to the appliance
What does the earth wire do? Prevents the electrical casing from becoming live
The neutral wire is ALWAYS at how many volts? 0V
The earth wire is USUALLY at how many volts? 0V
Why do we call plastic an insulator? It stops current from flowing
What do we call it when an appliance has a plastic casing? Double insulated
When an appliance is double insulated, what doesn't it need? An earth wire
Describe how a fuse makes an appliance safe when there is a fault 1. Live wire touches metal case 2. Big current surges to earth 3. Large current surges through live wire, causing fuse to melt 4. Isolating whole appliance and stopping current from flowing
What 2 reasons make circuit breakers more convenient than fuses? 1. They can be reset by flicking a switch, whereas fuses have to be replaced 2. They act quicker than fuses
Name the most common type of circuit breaker Residual Current Circuit Breaker (RCCB)
Explain how a RCCB works 1. When someone touches live wire, current flows through them to earth, meaning neutral wire now carries less current than live wire 2. RCCB detects change in current and breaks circuit
State 2 advantages of connecting lamps in parallel rather than in series 1. All lamps can be switched off individually 2. If one bulb breaks, the others will keep working
State an advantage of connecting lamps in series Less material used
Created by: JoeMather
Popular Physics sets

 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards