symbols used in circuit diagram Flashcards
What are the two types of current sources?
Alternating Current (AC) and Direct Current (DC)
AC examples include mains power in a house and AC generators. DC examples include cells and batteries.
What is the purpose of joining multiple cells together in series?
To form a battery that provides a strong current
Alternatively, a store-bought battery can be used.
What is a key in a circuit?
A device used to turn the current on and off
Examples include plug keys, switch keys, and tapping keys.
What is resistance wire made from?
An alloy called manganin
It has a fixed resistance depending on its length and thickness.
What does a rheostat do?
Allows resistance in a circuit to be varied continuously
It is used to adjust the magnitude of current in a circuit.
What is the function of a resistance box?
Allows a resistance of any desired value to be used in steps
It is connected in series between two terminals.
What instrument is used to measure the magnitude of current flowing in a circuit?
Ammeter
It has very low resistance to avoid altering the circuit.
What is the purpose of a voltmeter?
To measure the potential difference between two points in a circuit
It has very high resistance to avoid drawing an appreciable current.
What does a galvanometer detect?
The presence of a very weak current in a circuit
It can also determine the direction of current flow.
What is a load in a circuit?
An appliance connected in a circuit
eg bulb
What materials are connecting wires typically made from?
Highly conductive metals like copper
bec of material They have negligible resistance and do not alter the circuit’s resistance.
what are connecting wires
the wired used to connect various electrical components
