5.1 Alternating current Flashcards
What is direct current
current goes in one direction only
Where is direct current supplied
by batteries
Where is alternating current supplied
the mains
What is alternating current
Current reverses direction very rapidly
How can alternating current work
The voltage switches between positive and negative values
What is the voltage of the UK
230V
What is the frequency of the mains in the UK
50Hz
What is frequency
The amount of times the current changes direction every second
What is the main benefit of using AC instead of DC
Very easy to use a transformer to increase or decrease the potential difference
Name appliances that use direct current
Phone, Laptop, Ipod
In alternating current what happens to the height if the potential difference of the supply increases
the height increases
In alternating current what happens if the frequency of the supply increases
peaks would be closer together
Whats the equation for power
voltage x current
What does a step up transformer do
increases voltage
decreases current
what does a step down transformer do
decreases voltage
increases current
