Electricity Flashcards
1
Q
What is the purpose of a transistor and what is the voltage needed to switch on both of them
A
To act as an electronic switch
MOSFET-2V
NPN-0.7V
2
Q
What is the mains voltage
A
230V with a frequency of 50HZ
3
Q
What are the definitions of dc and ac
A
DC or Direct Current is when the current flows in only one direction.
AC or Alternating Current is when the current flows in one direction before flowing in the other direction.
4
Q
If the supply voltage isn’t known what calculation can be done
A
V1 R1
—- = —-
V2 R2
5
Q
How does a thick metal strip protect a building from damage
A
The metal strip is a conductor and more current will pass through the strip than the building
6
Q
What is the charge of one proton
A
1.6 x 10 -19
