Study Physics Chp. 20 Review Flash Cards

 
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Physics Chp. 20 Review

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What does a fuse or circuit breaker do?
opens the circuit when the current gets too large
Where would you place a switch to protect a circuit element?
on the same branch as the element
Where would you place a switch to control a circuit element?
on the same branch as the element
What is a short circuit?
A circuit that has low resistance (no load) and a dangeroulsy large current
When calculating the utility bill what units must the energy be in?
kWh
When calculating the utility bill what units must the time be in?
h(hours)
When calculating the utility bill what units must the power be in?
kW
What is the equation to determine the energy used by a circuit?
E= P*t
What is the equation to determine the power used by a circuit?
P=IV=V^2/R
What is the equation for the equivalent resistance of a parallel circuit?
Rtot = (1/R1+1/R2+...)^-1
What is the equation for the equivalent resistance of a series circuit?
Rtot= R1+R2+...
What is needed for a circuit to work?
a potential difference (a connection to the + and -) and
a closed loop
What happens if one load goes out in a parallel circuit?
the other loads stay on
What happens if one load goes out in a series circuit?
they all go out
What happens to the total power of the circuit if you add more loads in a parallel circuit?
it increases
What happens to the total power of the circuit if you add more loads in a series circuit?
it stays the same
What happens to the power for each load as you add more loads in a parallel circuit?
it stays the same
What happens to the power for each load as you add more loads in a series circuit?
it decreases
What is a series circuit?
A circuit where the elements are on the same branch
What is parallel circuit?
A circuit where the elements are on multiple branches
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