Chapter 16-Electric Circuits Flashcards
Define the term current electricity.
The flow of electrons through a conductor.
Define the term electromotive force (EMF).
Total energy supplied per coulomb charge by the cell (it is a measurement of the energy that causes current to flow through a circuit).
Define the term potential differences.
The work done per unit charge.
Define the term current.
The rate of flow of charge.
Define the term resistance.
Material’s opposition to the flow of electric current.
Define the term conventional current.
Charge flows form the positive pole of the cell, through the circuit, to the negative pole of the cell.
Define the term electron flow.
Electrons flow through the circuit from the negative pole of the cell to the positive pole of the cell.
Define the term ohm’s law.
Current through a conductor is directly proportional to the potential difference across the conductor at constant temperature.
What does the EMF do?
It’s like a cell, a voltage where the charge is gaining energy.
What does the potential difference do?
It is like a light bulb, a voltage where the charge is loosing energy.
What is the ampere measured in?
It is used to measure the current.
Why is an ammeter always placed in series?
It is always placed in series in a circuit as it wants to measure the rate of flow of charge passing through it.
Why is the resistance of an ammeter low?
They have a low resistance as to not influence the rate of flow of charge.
What is necessary for a current to flow in a circuit?
- a closed circuit.
- a source of electrical potential energy.
What is used to measure the potential difference?
A voltmeter measures in volts.
