Chapter 4 Electric Circuits Flashcards
4.1 What do the same charges do
They repel each other
4.1 What do different charges do (i.e. positive or negative)
They attract each other
4.1 What do insulating materials do when they are rubbed together
They are charged. An example is a polythylene rod being rubbed a cloth.
4.1 The force between two charged objects are contact or non-contact
They are non-contact forces.
4.2 What is an electric current?
It is a flow of charge
4.2 Charge flow equation
Current x time taken
4.3 What does the ammeter measure
The current in amps
4.3 What does the voltmeter measure
The potential difference. It must be parallel to the torch bulb so it measures the potential difference across.
4.3 Potential difference equation
Energy transferred (J) /charge (coulombs)
4.3 Resistance (ohms) equation
Potential difference volts /current amps
4.4 What is a light-emitting diode (LED)
A diode that emots light when current passes through in a forward direction.
4.4 Diode definition
A non-ohmic conductor
4.4 What is a thermistor
Temperature-dependent resistor
4.4 What happens to the resistance of the light-dependent resistor when the light intensity increases?
The resistance decreases
4.5 What happens to the current in a series circuit?
The same current passes throught the component (doesn’t change)
