8.2 Electricity Flashcards
What is current?
The rate at which the charge of the electrons flow
What is current measured in.
Amps
What is voltage?
Voltage is the energy transferred per charge
Whats another word for voltage?
Potential difference
What unit is voltage measured in?
Volts
Which way does current flow?
Positive to negative
What is the definition of a series circut?
When components are on a single loop
What are the advantages of a series circut?
Fewer wires used, all the components are controlled by a single switch
What is the definition of a parallel circut?
Components on multiple branches
What is an advantage if a parallel circut?
Switches on each branch control components individually
What does an ammeter measure?
Ammeters measure current
What do ammeters measure in
Amps
How are ammeters placed in a circut?
They are placed in series with components to find the current flowing in that part of a circuit
What does a voltmeter measure?
Voltage
What does a voltmeter measure in
Volts
How is a voltmeter placed in a circuit?
They must be placed in parallel across a component to find the voltage dropped across it
What Is The rule for current in a series circuit?
Current in a series circuit stays the same
What is the rule for current in a parallel circuit?
Current in a parallel circuit splits at junctions
What is the rule for voltage in a series circuit?
Voltage of a cell in a series circuit is split to all the components
What can’t energy do?
Be made or destroyed
What is the rule for voltage in a parallel circuit?
Voltage on each branche in a parallel circuit is the same as the cell
What is ohms law?
Voltage is directly proportional to current through a fixed resistance.
What is the equation that connects current, resistance and voltage?
V= I x R
What is the unit for resistance?
Ohms
