USING ELECTRICITY Resistance Flashcards
Voltmeter measures ____ in _____
Voltage in parallel (out of circuit)
Ammeters measure ___ and are placed in ___
Current, series (in the circuit)
What is resistance?
The measure of the difficulty the charges behave in moving through a circuit.
Increasing resistance in a circuit _____ voltage.
Decreases
What is resistance measured in?
Ohms
Variable resistors vary resistance. Give examples
- volume of resistance
- estriol gauges if cars
When thee is current in a circuit, some electrical energy converts to ___ due to ______
Heat, resistance
What is power?
The rate at which electric,a energy turns to other forms
Power is measured in
Watts
Energy is measured in
Joiles
Where does the energy change take place in discharge lamps?
Gas
Where does the energy change take place in filament lamps?
Resistance wire
Are discharge or filament lamps more effective?
Discharge as they transfer more into light and less into heat.
What does resistance depend on?
Type of material (better the conductor the lower the resistance), length of material (longer the higher), thickness of the material(thicker higher), temperature of the material(the higher the temperature the higher the resistance).
Why, in terms of electrons and atoms, does the wire heat up?
When the electric current passes through a wire, the electrons making up the current collide with the atoms of the wire which generates heat.
