Download Electric Circuits

Steven Barron
Are all of the electrons flowing in
a circuit provided by the battery?

No because the wires and the filament
already consist of conduction electrons,
the battery is just the power supply.
Why must there be no gaps in an electric
circuit for it to carry current?

Current is the measure of the flow of
electrons. Electrons are particles that
cannot flow if there is a gap
Distinguish between a series circuit and a
parallel circuit.

In series circuits, the resistance adds
up. In parallel circuits the resistance is
reduced by the formula R1 X R2 /
R1+R2. So two 4 ohm resistors in
parallel would be equal to (1) 2 ohm
resistor in place of the (2) 4 ohm
resistors
If one of 3 lamps blows out when connected in series,
what happens to the current in the other two? What if it
happened in a parallel circuit?

If three lamps are connected in parallel
and one blows out, the current in the
other two does not change. This
assumes that the net change in total
current does not cause the power
source to change voltage.
In which case will there be more current in each
of 3 lamps - if they are connected to the same
battery in series or in parallel?

more current will be in case of parallel
because in series combination
resistance is greater with respect to
parallel combination
What is meant by resistance in a circuit?

Resistance of circuit is opposition
offered to flow of current by that circuit.
Causes:
1. it opposes the flow of current
2. it ipposes the voltage
3. it protect the electrical component.
4. it protect from any electrical hazards
What happens to the total circuit resistance when more
devices are added to a series circuit? To a parallel
circuit?

Adding more resistors in series to a
particular parallel branch will increase
the total resistance, but adding another
branch will decrease it.
1/R_total = 1/R_1 + 1/R_2 + ... + 1/R_N
What is the function of a fuse or circuit
breaker in a circuit?

a fuse is a device which contains very
thing conductor inside.
its function:
if the current exceeds more than
needed, the fuse breaks ,and avoids the
damage.
Why will too many electric devices operating at one time
often blow a fuse or trip a circuit breaker?

the combined currents of the "electrical
devices" exceeds the rating of the fuse
What is meant by a "short
circuit"?

A short circuit is a type of failure in an
electrical circuit caused when the wire
touches another hot wire or touches a
neutral wire. It can also be caused if
there is a break in a wire or connection.