Electromagnetism. Flashcards
Ammeter is connected in?
Series.
What is electric current.
The rate of flow of charges.
Formula of electric current and measured in?
I= Q/t and coulombs.
What is direct current.
Current is always in the same direction.
Alternating current?
Chang8ng magnitude and the direction of the current,
Potientiak diffrence?
Difference between two points ina circuit is the work done to drive one coulomb charge between these two points.
Formula for voltage?
v= E/Q
EMF IS?
Work done by the source to drive 1 coulomb of charge round a closed circuit.
Voltmeter is connected
Parallel.
kj to j is?
x1000.
Resistor formula.
R= v/I
Two factors that affect resistance.
Length and cross sectional area
Explain the factors affecting resistance.
As length 8ncreases resistance increases. As cross external area increases resistance decreases.