Voltage Flashcards
Potential difference will exist between two points in a circuit that have a?
Difference in charge
What is Potential Difference measured in?
Volts (V)
What is the name of the force that drives the current through a circuit?
Electromotive force (EMF)
Name 6 methods by which voltage can be produced.
- Chemical
- Friction
- Induction
- Pressure
- Heat
- Light
- PILCHF
To produce a voltage chemically, the two metal plates need to be made of?
Dissimilar metals
List all the requirements needed to produce a voltage by induction.
- An electrical conductor
- A magnetic field
- Relative movement
What determines the polarity of an induced voltage?
The direction of movement between magnetic field and conductor
What determines the amount of voltage produced by a thermocouple?
- The two types of material used
- The difference in temperature
What is the name given to the materials in a solar panel?
Semiconductors
(The amount of voltage depends on the intensity of light)
What is the definition of Potential difference?
Potential difference will exist between any two points in a circuit having a difference in charge.
What is an Electrolyte?
A substance that conducts electricity
Explain Voltage produced by friction
Rubbing certain different material together causes the valence electrons of 1 material to be transferred to the other, making the second material negative.
Describe Piezo-Electric pressure.
A piezo is a quartz crystal that has positively charged silicon ions and negatively charged oxygen ions.
When you press them together it induces Voltage
Where will you find piezo crystals?
Lighters
Airbags
How does a Thermocouple work?
If two wires of dissimilar materials are bought to different temperatures, an electrical potential (Voltage)is produced between them.
