Physics - Parallel Circuits

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What is a parallel circuit?
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A circuit with more than one branch/path for current to flow through
What happens to the current in a parallel circuit?
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The current splits between the branches
What rule applies at a junction?
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Total current = total current leaving.
What is the equation for current in parallel circuits?
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Itotal = I1+I2+I3
What happens to voltage in a parallel circuit?
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Voltage is the same across every branch
What is the voltage rule for parallel circuit
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Vtotal=V1=V2=V3
If a battery is 6v, how much voltage does each branch receive in parallel?
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Each branch receives 6v
What happens when one bulb breaks in a parallel circuit?
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The other bulb stay on
Why do bulbs stay bright in parallel?
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Each bulb receives the full battery voltage.
What happens to the total resistance when more branches are added?
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Total resistance decreases.
Why does resistance decrease in parallel circuits?
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Because there are more paths for charge to flow
What happens to the total current when resistance decreases?
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Total current increases
Which equation links voltage, current, resistance?
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V=IxR
Why are household circuits connected in parallel?
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So appliances work independently and each gets full voltage.
What happens to current in a branch with higher resistance?
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Less current flows through it.
What device measures current?
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An ammeter
How is an ammeter connected?
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In series
What device measures voltage?
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A voltmeter.
How is a voltmeter connected?
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In parallel across a component.
What are the advantages of parallel circuits?
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Components work independently / full voltage across each branch / one broken component doesn’t stop the others
What are the disadvantages of parallel circuits?
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More wiring needed / More complicated / battery drains fast
In series or parallel circuits is current the same everywhere?
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Series circuits only
In series or parallel circuits is voltage the same across components?
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Parallel circuits only
What is a common exam mistake with parallel circuits?
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Saying voltage splits between branches

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