Current Electricity Flashcards
Examples of good conductors?
All metals and graphite
An electrical conductor is a material a which will allow ______ to pass through it.
Electrical current
Examples of bad conductors?
Liquids (apart from mercury) and gasses
Conductors have ___
Free electrons
The drift of ____ makes the current
Free electrons
Moving electrons collide with the metal ions to cause the
Resistance of the metal
When free electrons collide with metal ions, they give the ions energy. This shows up as an increase in the metal…
Temperature
Resistance is inversely proportional to
Cross sectional area
Resistance is directly proportional to
Length
State the connection between charge and current equation
Q=It
Gradient is
Rise over run
State the equation for resistance
R=V/I
What is resistance
The ratio of the voltage across an object to the current through it
State the ohms law equation
V=IR
State the unit of measurement for resistance
Ohms
