Embed Size (px)
Citation preview
Potential Difference(Voltage)
Potential DifferencePotential difference, or voltage, is the difference in electric potential energy per unit of charge measured at two points.
The symbol for potential difference or voltage is V.
The units of potential difference or voltage is volts (V).
Potential Difference can be compared to the flow of water from water towers.
From which tap will the water exit with the greatest force? Why?
Potential Difference can be compared to the flow of water from water towers.
From which tap will the water exit with the least force? Why?
Another Potential Difference Analogy
VOLTMETERS are used to measure the
__________________________ in a
circuit.
potential difference / voltage
How to use a VOLTMETER
V0
How to use a VOLTMETER
V0 is the voltage across the power source.
V1 is the voltage across the bulb.
Example: We want to measure the voltage at V0 and V1 for the circuit below.
V1
To measure the voltage at V0 and V1, the circuit is
______________________.
The voltmeter is connected in ____________.
NOT disconnected
How to use a VOLTMETER
parallel
Connect the terminal of
the voltmeter to the wire(s) leading to the
___________________terminal of the power
source.
positive / red
How to use a VOLTMETER
positive / red
Connect the terminal of
the voltmeter to the wire(s) leading to the
___________________terminal of the power
source.
negative / black
How to use a VOLTMETER
negative / black
How to use a VOLTMETERTo measure V0 :
How to use a VOLTMETERTo measure V0 :
How to use a VOLTMETERTo measure V1 :
How to use a VOLTMETERTo measure V1 :
How to Read a VOLTMETER
How to Read a VOLTMETERWhat is the reading on this voltmeter?
How to Read a VOLTMETER
What is the reading on this voltmeter?
If you connected the circuit to the 3V setting on the voltmeter, then the voltage reading is 1.5 V.
If you connected the circuit to the 1V setting on the voltmeter, then the voltage reading is 0.5 V.
