Circuits Flashcards

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1
Q

In series circuits…

A
  • the more cells, the higher the potential difference
  • potential difference is shared between all components
  • there is only one loop, if your remove a component the circuit is broken
  • the same current flows through the entire circuit
  • total resistance is the sum of the resistance of all resistors in the circuit
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2
Q

In parallel circuits…

A
  • each component is connected separately except ammeters which connect in series
  • if you remove one component it will hardly affect the others
  • potential difference is the same across all the components
  • current is shared between each loop, sum of current in each loop = total current of circuit
  • adding loops and components decreases total resistance
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3
Q

What is ohms law

A

V = IR
Voltage = current x resistance
- if V and I are directly proportional, R stays constant

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4
Q

What does ohms law state

A

The current through a conductor is directly proportional to the potential difference across it
- only relevant at constant temperatures

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5
Q

What are ohmic conductors

A

Electric conductors that obey Ohm’s law
- fixed resistors
- wires
- heating elements
* make a straight line through origin when plotted on an IV graph

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6
Q

What are non ohmic conductors

A

Don’t follow Ohm’s law
- filament lamps

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7
Q

Why are filament lamps non ohmic

A
  • their current and potential difference aren’t directly proportional, this is because the resistance of the lamp increases as it’s temperature increases
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