Current Electricity Flashcards
what happens when insulated materials are rubbed together?
the material becomes charged (either negatively or positively)
What is transferred when the objects become charged?
either:
- The material becomes negatively charged (gains electrons)
- The material becomes positively charged (looses electrons)
what happens to oppositely charged materials
they attract
what happens to materials with the same charge
they repel
What does an ammeter measure?
the current
what does a voltmeter measure?
Potential difference (volts)
what does Ohm’s law state?
The current through a resistor at constant temperature is directly proportionate to the potential difference across the resistor
reversing the current through a component also reverses what?
the voltage
what happens to the resistance of a filament bulb when the temperature of it increases?
it increases.
what is the resistance like of a diode with a forward current?
low resistance
what is the resistance like of a diode with a reverse current?
high resistance.
what happens to a thermo resistor if the temperature of it increases
it’s resistance decreases
what does LDR stand for?
Light Dependent resistor
resistance of the LDR changes how if the light intensity on it increase?
resistance decreases
in a series circuit how is the current distributed to each component?
each component has equal current
