Topic P3: Electricity; Flash Questions

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  • Created by: MiriamL
  • Created on: 15-11-19 13:49
What do all materials contain?
Positive and negatively charged particles, usually equal in number making them overally neutral
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What does the transfer of electrons from one negatively charged material to another create?
One positively charged materail and one negatively charged
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How do we cause this transfer?
Friction (rubbing)
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Which material is positive
The one that looses electrons
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Which material is negative
The one that gains electrons
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What do oppositely charged obkects do?
Attract
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What do similarly charged objects do?
Repel
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What is the region around a charged object called
electric field
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What do field lines show?
The direction a positive charge would move in placed in the field
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What is needed for a current to flow?
A potential difference (voltage) abd a conductor
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current=
charge/time
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Q=
I*T
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What does the size of the current depend on?
Voltage of the power supply and resistance of the cirucit.
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Energy=
charge*potential difference
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Energy=
current*time*pd
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What two things do you need to make a current flow?
Cell/battery and a complete circuit
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What is the current everywhere in a single closed loop?
The same
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Charge flow=
current*time
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What are small currents measured in
milliAmps (mA)
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What is needed to make a current flow in a circuit?
Potential difference
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What happens in a battery?
Substances react to seperate charges making one side positive and another negative
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Which charged terminal has the higher electrical potential?
Positive
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What does the potential difference and current that a cell can deliver dependant upon?
Construction of the cell (not the size)
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What does the longer line on a symbol for a cell show?
Positive
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What happens when you apply a pd between the ends of a piece of wire?
You set up an electrical field
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When you connect a voltmeter acriss a componenet in a circuit what are you measuring?
Work done or energy transferred by the charges in the component. This is called electrical working
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Energy transferred=
potential difference*charge
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What can you measure current with? Why must this be in the loop?
Ammeter. The charge needs to flow through them
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Where do you need to connect a voltmeter?
Both sides of a component
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If you measure the currents at different points in a parralel citcuit what should they add up to?
The current near the battery
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Other cards in this set

Card 2

Front

What does the transfer of electrons from one negatively charged material to another create?

Back

One positively charged materail and one negatively charged

Card 3

Front

How do we cause this transfer?

Back

Preview of the front of card 3

Card 4

Front

Which material is positive

Back

Preview of the front of card 4

Card 5

Front

Which material is negative

Back

Preview of the front of card 5
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