Where does the current come from that moves the needle on an ...

[bobbysung]

Where does the current come from that moves the needle on an analog volt meter?
 
  A) The volt meter uses induction to produce a small electric current using the magnetic field surrounding the wire it is testing.
  B) The battery inside the meter
  C) No current is required to move the needle on an analog volt meter.
  D) The meter uses a small amount of current from the circuit it is testing.

Question 2

Why are piercing valves used in refrigerant work?
 
  A) To access a sealed system B) To allow a constant evacuation
  C) To install a gauge manifold set D) To remove a process tube

[nguyenhoanhat]

Answer to Question 1

D

Answer to Question 2

A

[bobbysung]

TY

[nguyenhoanhat]

You're welcome