P4- Electric circuits Flashcards
How do some insulators become charged?
By rubbing another insulator on it
When a cloth was rubbed against a rod the cloth became positively charged, why?
Negatively charged electrons were transferred from the cloth to the rod. More positive charges on the cloth
How does a non contact force occur?
When two charged objects exert a force on each other
What happens to…
Same charges?
Dif charges?
Same changes repel
Dif charges attract
Switch
What does it do?
How does it look?
Enables current to be turned on and off
Two circles with diagonal line between
Cell
What does it do?
How does it look?
Pushed electrons around a circuit
Big line parallel to smaller line
Battery
What does it do?
How does it look?
More than one cell
A cell with dashed line between
Diode
What does it do?
How does it look?
Allows current to pass in the forward direction
Arrow in a circle
Fixed resistor
What does it do?
How does it look?
Reduced the current
Rectangle
Variable resistor
What does it do?
How does it look?
Allows current and resistance to be changed
Rectangle with arrow through it
Light emitting diode (LED)
What does it do?
How does it look?
Emits light when current passes through it in a certain direction
Diode with arrows off it
Lamp/bulb
What does it do?
How does it look?
Emits light when current passes through it
Circle with cross in it
Fuse
What does it do?
How does it look?
Melts and breaks circuit is current is too high
Rectangle with line through it
Voltmeter
What does it do?
How does it look?
Measure potential difference
Circle with V
Ammeter
What does it do?
How does it look?
Measures current
Circle with A