Save
Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


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.
We do not share your email address with others. It is only used to allow you to reset your password. For details read 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
share
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

gcse science P4 - C

specific for ocr gateway additonal science B.

QuestionAnswer
what is an electric current? a flow of electric charge
what is charge carried by? negatively charged electrons
what direction do the electrons flow in a circuit? the opposite direction to the current
what is current measured in? amperes (A)
what is used to measure current? ammeter connected in series
what is the current in a circuit due to? electron movement
how does this work? -electrons are pushed around the circuit by the battery -they bump into atoms in the resistor, giving the electrons energy -their energy makes the atoms vibrate more, so the resistor gets hotter and its resistance increases
what changes the resistance? a variable resistor (rheostat)
what increases the current? what decreases the current? -a low resistance -a high resistance
what is the potential difference(pd)between two points in a circuit? the difference in voltage between the two points
what is potential difference measured in? volts (v)
what is used to measure the potential difference? voltmeter connected in parallel
what happens if the voltage increases? the current increases
what happens if the resistance increases? the current decreases
what is resistance measured in? ohms (Ω)
what does the live wire do? carries a high voltage around the house
what colour is the live wire? brown
what does the neutral wire do? completes the circuit, providing a return path for the current
what colour is the neutral wire? blue
what does the earth wire do? connected to the case of an appliance to prevent it becoming live
what colour is the earth wire? green and yellow stripes
what does the fuse do if the current becomes too large? melts and breaks the circuit, so no current can flow. this prevents overheating and further damage to the appliance
how do earth wires and fuses prevent a person from receiving and electric shock if they touch a fault appliance? as soon as the case becomes live, a large current flows in the earth and live wires, and the fuse blows
why doesn't a re-settable fuse (circuit breaker) need to be replaced to restore power? it can be re-set
Created by: jirwin
 

 



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