Chapter 16 - Electrical Charges Flashcards
How can materials become charged and what becomes charges in them?
Rubbing them together, electrons become charged
When an insulating material is becoming positively charged when being rubbed together, what happens to electrons?
They lose electrons
When an insulating material is becoming negatively charged when being rubbed together, what happens to electrons?
They gain electrons
What is true about like charges?
They repel
What is true about different charges?
They attract
What is a charged atom called?
Ion
What makes up the nucleus of an atom?
Protons and neutrons
What does a battery consist of?
2 or more cells connected to eachother
What is the size of electric current equal to?
The rate of flow of charge
State Ohm’s law
Current through a resistor at a constant temperature is directly proportional to the PD across the resistor
What happens to the PD if you reverse the current across the resistor?
The PD gets reversed as well
How do you connect an ammeter in a circuit?
In series with the component
How do you connect a voltmeter in a circuit?
In parallel with the component
What happens in a filament bulb?
Resistance increases as filament temperature increases
What happens in a diode?
Forward resistance is low, reverse resistance is very high?
What happens in a thermistor?
Resistance decreases as temp increases
What happens in an LDR?
Resistance decreases if light intensity increases
What is true about components in series?
Current is the same in all of them, total PD is shared, sum of all resistances = total resistance,
What is true about components in parallel?
Sum of all currents = total current, PD across each component is the same
What does increasing the resistance in a parallel circuit do?
Lowers the current
