Parallel Circuits
Current branches, shared voltage, and multiple conducting paths
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Series or Parallel??
Dorling Kindersley Books Bozeman Science
Show Me The Physics
2) Parallel Circuit - circuit in which each component has its own circular path back to the source.
Dorling Kindersley Books
Ex 2)
a) IT = I1 + I2 + I3 + ...
For example:
If I1 = 2 amps, (ignore picture above)
Then ...
IT = 9 amps
b) The voltage drops across each component in parallel are equal
VT = V1 = V2 = V3
VT = Source Voltage
** Write in the correct voltages
c) V1 = I1R1
V2 = I2R2
V3 = I3R3 etc.
d) Current in 1st & 2nd resistor?
e) What’s R3?
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Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. A parallel circuit is one in which:
2. Three parallel branches carry 2 A, 3 A and 4 A. What is the total current from the source?
3. A 12 V battery is connected to three resistors in parallel. What is the voltage across each resistor?
4. A 4.0 Ω resistor is one branch of a parallel circuit with a 12 V source. What is the current in that branch?
5. In a home wired in parallel, one light bulb burns out. What happens to the other lights?