Voltage in Electrical Systems. 1.3.2. Objectives. Define electric potential, or voltage. Differentiate between AC and DC. Identify the most common source of DC voltage. Describe how to connect DC voltage sources so that voltage will be added.
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Unit is Newton per Coulomb (N/C)
Click on this link to go to an electric field simulation from Phet
Gravitational potential difference predict how forces are transmitted from one object to another. – ability to accelerate a mass between two heights.
GPE = mgh
Electric potential difference (or voltage) – ability to accelerate an electric charge between two points in an electric field.
V = E d
Units: N•m, or J
Units: N•m/C, or J/C (or Volt, V)
Flow caused by “potential” difference
Current – Flow
Recall, pressure is a prime mover in fluid sytems. predict how forces are transmitted from one object to another.
Voltage is a prime mover in electrical systems.
The flow of charge is called current. Current continues until the plates are neutral.
Use this Phet web site link for DC Circuit Construction to download and practice making DC circuits.
Click on this Phet web site link for DC Circuit Lab to get more practice with DC circuits
AC Circuit Demonstration predict how forces are transmitted from one object to another.
Click on this Phet web link on AC Current – click on the link, download the program and practice making AC circuits
Click on this Phet web link for the AC Current Lab simulation.
Unit is Newton per Coulomb (N/C) predict how forces are transmitted from one object to another.
Voltage predict how forces are transmitted from one object to another.
E = electric field
d = distance
Unit is volts
V = E x d
Unit is V/m
E = V/d
Unit is meters
d = V/E
Vnet = Vf – Vi
# of electrons x elementary charge
Unit is Coloumb
Direct current predict how forces are transmitted from one object to another.
Total voltage is the sum of all voltage sources
Vt = V1 + V2 + V3….
Battery + battery + battery – conductor (wire) – load – wire
Total voltage is difference between the voltage sources on each side of the load.
Vt = V on side one – V on side 2
Battery – conductor – load – battery in reversed position - conductor