voltage Flashcards
What is the potential difference in a circuit?
A difference in electrical charge between two points in a circuit
What is Electromotive Force (EMF)?
The force driving the current around the circuit
What does potential difference give rise to?
Electromotive force
What is another name for the pressure that causes current to flow?
Induction
What is the basic unit of measurement of voltage?
Volts
How many methods are there by which voltage can be produced?
Six methods
Name six methods by which voltage can be produced.
- Chemical
- Friction
- Heat
- Induction
- Pressure
- Battery
What is the solution called when battery posts are placed in a chemical solution?
Electrolyte
If there are more protons on a plate, what is the polarity of that plate?
Positive
If there are more electrons than protons on a plate, what is the polarity of that plate?
Negative
What are the three requirements needed to produce a voltage by induction?
- Magnetic field
- Conductor
- Movement
What must the movement of a conductor do to generate voltage?
Cut the magnetic lines of force
Does it make any difference to producing a voltage if the conductor moves or the magnetic field moves?
No
Where would we find a piezo-electric pressure system in everyday use?
Lighter
How can we produce a potential difference with two different metals?
Thermocoupling
What determines the amount of voltage produced by a thermocouple?
The difference in temperature between the two materials
What is the name of the instrument described in the context of thermocoupling?
Thermocouple
What is the name given to the materials in a solar panel?
Semiconductors
