PARALLEL CIRCUITS

rules The total current from the battery is equal to the current flowing through each resistor added together (it splits at the junction) the voltage is the same across each part (and equal to the supply voltage)

3V Question 1 - - - - - - - V1 - - - - - - V2 - - - the voltage is the same across each part (and equal to the supply voltage) V1 V2 = =

- - - - - - - - - - - - - - - - 4A Z X Y X Y Z = = = Question 2 - 4A - - - Z - - - - These bulbs are identical - - - - X - - - - Y In a parallel circuit the current is shared out The current in each branch always adds up to the current drawn from the supply X Y Z = = =

3V Question 3 X 4A 3V 2A Z Y X Y = = Z =

Is the current always shared out equally?

Question 4 - - - 4A - - - 4A - - - - - - - - 3A - - X X =

= = 4A Z Y 1A Y Z The amount of current flowing through each Question 5 4A Z Y 1A The amount of current flowing through each branch depends on the resistance. The larger the resistance the smaller the current Y Z = =

Rules you should remember and use The total current from the battery is equal to the current flowing through each resistor added together (it splits at the junction) the voltage is the same across each part (and equal to the supply voltage)

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Answers 1 V1=3V and V2=3V 2 X=2A, Y=2A and Z=4A 3 X = 4A, Y=2A and Z=3V 4 X=1A 5 Y=3A and Z=4A