Chapter 4 - Current Electricity Flashcards
What does the process charging by friction mean
When a material that has gained electrons becomes negatively charged because electrons have a negative charge and the one that has lost electrons is left with a positive charge
What do you measure the current through a component with
An ammeter
How is an ammeter placed in a circuit
In series with the component
What is the potential difference measured with
A voltmeter.
How are voltmeters placed in a circuit
In parallel with the component.
What does Ohm’s law state
The current through a resistor at constant temperature is directly proportional to the potential difference across the resistor.
Why does the resistance of the filament bulb increase
Because the current increases
What happens the bigger the resistance of a component
The smaller the current through it
Why are parallel circuits much more useful than series circuits.
A beak in one part of the circuit doesn’t stop charge flowing in the rest of the circuit
What happens when two electrically insulating materials are rubbed together
Electrons are rubbed off one material and deposited on the other.
