Electricity and Magnetism MTA Flashcards
What is the circuit symbol for an open switch?
What is the circuit symbol for a closed switch?
What is the circuit symbol for a cell?
What is the circuit symbol for a battery?
What is the circuit symbol for a resistor?
What is the circuit symbol for a variable resistor?
What is the circuit symbol for a lamp?
What is the circuit symbol for a fuse?
What is the circuit symbol for a voltmeter?
What is the circuit symbol for an ammeter?
What is current?
The rate of flow of charge
What type of circuit is shown in the image?
Series circuit
What equation links potential difference, current and voltage?
Potential difference = current x resistance
V = I R
For a given potential difference, what happens to the current when the resistance increases?
The current decreases.
What is the rule for current in a series circuit?
Current is the same everywhere in the circuit
What is the rule for potential difference in a series circuit?
Potential difference is shared between components.
Where should you place an ammeter to measure current through a component?
The ammeter should be placed in series with the component.
What is the rule for potential difference in a parallel circuit?
It is the same in each branch.
Where should you place a voltmeter to measure potential difference across a component?
The voltmeter should be placed parallel to the component.
What is the total resistance of the three resistors in series?
25 Ω
What is the rule for current in a parallel circuit?
Current is shared between the branches.
Name the equipment used to measure potential difference.
Voltmeter
In a parallel circuit, what happens to the total resistance when you add a resistor?
The total resistance decreases.
Name the equipment used to measure current.
Ammeter
When two insulating materials are rubbed together, what charge will the material that gains electrons have?
Negative
When certain insulating materials are rubbed together, what will be scraped off one and transferred onto the other?
Electrons
What do like charges do?
Repel
Name the force that causes a build up of static charge.
Friction
When two insulating materials are rubbed together, what charge will the material that loses electrons have?
Positive
Name the force exerted between charged objects.
Electrostatic
What do opposite charges do?
Attract
What is meant by the term ‘resistance’?
How difficult it is for current to flow
