2.2 - Series and Parallel Circuits Flashcards Preview

GCSE Physics - Delete Me > 2.2 - Series and Parallel Circuits > Flashcards

Flashcards in 2.2 - Series and Parallel Circuits Deck (13):
1

What does a series circuit look like?

Lots of components directly connected together in a single line [Diagram TBC]

2

What does a parallel circuit look like

Components connected in several "branches" or "loops" [Diagram TBC]

3

For components connected in SERIES, total current is...

... the same through every component

4

For components connected in SERIES, total potential difference is...

... shared between all components

5

For components connected in SERIES, total resistance is...

... the sum of the resistance of each component

6

For components connected in PARALLEL, total potential difference is...

... the same for each component

7

For components connected in PARALLEL, total current is...

... the sum of the current passing through each component

8

For components connected in PARALLEL, total resistance is...

... less than the resistance of the smallest resistor

9

Why does total resistance increase if a resistor is added in series?

  • Adding a component decreases the potential difference for every component
    • because P.D is shared between components in series
  • Decreasing the P.D. means current for every component must also decrease (V=IR)
  • If current passing through each component decreases, total current also decreases
    • because current is the same between components in series
  • Total resistance must increase if total current decreases (V=IR)

10

Why does total resistance decrease if a resistor is added in parallel?

  • Potential Difference is unchanged by adding a resistor
  • Current through the old resistors is the same as before (V = I R, with V and R unchanged)
  • New resistor must also have some current (V = IR)
  • Total current is greater than before (old current + new current)
  • Total Resistance must be smaller than before (V = I R, with V unchanchanged)

11

How can you measure the current flowing through a component?

  • Create a circuit with the component
    • unbroken circuit
    • has a power source
  • Use an ammeter
    • In series (current is the same for components in series)

12

How can you measure the potential difference across a component?

  • Create a circuit with the component
    • unbroken circuit
    • has a power source
  • Use a voltmeter
    • In parallel (potential difference is the same for components in parallel)

13

How can you measure the resistance of a component?

  • Create a circuit with the component
    • unbroken circuit
    • has a power source
  • Measure the current passing through the component
    • Ammeter
    • In series (current is the same for components in series)
  • Measure the potential difference passing through the component
    • Voltmeter
    • In parallel (potential difference is the same for components in parallel)
  • Resistance is the potential difference divided by the current (V = I R )