Electricy Flashcards
Current is defined by?
how much electrical charge has been transferred per second
What is mains supply?
230v, is a alternating current
When voltage is connected across a wire?
An electrical field is produced in the wire
What do electrons experience which moves them through the wire
A force which causes a movement of charged particles or current
What are the factors that affect the resistance of a conductor
-material
-length
-thickness
-temperature
What do all conductors show
some opposition to electrical current
What are the two main ways of increasing the current in an electrical circuit
increasing the voltage or by decreasing the resistance
If you increase the number of land in a series circuit there will be?
Less current, the lamps resist current
What happens if you put more lamps into the circuit
there is more resistance
if there is more than one voltage or current what do you use?
resistor value
if there is more than one voltage or current what do you use?
resistor value
When a resistor is kept at a constant temperature?
It’s resistance will remain unchanged
A change in temperature can cause
A changed in resistance for some material. These materials are known as non-ohmic conductors
When resistors are connected together in series
We can add their resistance together to find the total resistance in the circuit
The resistance of the thermistor is
not constant for different values of current
In parallel the total resistance is smaller than
the smallest value resistor
