Parallel Circuits
Parallel Circuits
A parallel circuit is a circuit that has two or more
loads connected so that current can divide and flow
through the load. Most electrical circuits are paral-
lel.
Characteristics of a parallel circuit:
1:
2:
The current has many paths.
The resistance in each load will determine the
current flow for that resistance.
The total resistance will always be less than the
smallest resistance in the circuit.
The voltage drop across all loads will be battery
Figure 4
3:
4:
voltage.
The formula for calculating resistance in a parallel
circuit is:
R = R1 x R2
R1 + R2
Basic Electrical Elements
Current is the directed flow of electrons through
the circuit.
Voltage is the electrical pressure that causes the
electrons to flow.
Resistance is a restriction to current flow.
CIRCUIT
ELEMENT
DEFINITION
UNIT OF
MEASUREMENT
UNIT
SYMBOL
MEASURED
WITH
FUNCTION
SWITCH
OHM’S
LAW
POSITION
CURRENT
VOLTAGE
The flow of
electrons
around a circuit
Amperes
(amps)
A
V
Ammeter
AC amps
or
DC amps
C=V÷R
V=CxR
The force
(pressure)
Volts
Voltmeter
ACV
or
which causes
current to flow
DCV
RESISTANCE
The opposition
(restriction) to
current flow
Ohms
A
Ohmmeter
Ohms
R=V÷C
Table 1
3
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