Ammeter, voltmeter and measuring a source
Answers are for parents and teachers.
1
Rg = 45 Ω, range ×10. What is the shunt (Ω)?
5
2
Rg = 100 Ω, range ×20. What series resistor (Ω) is needed?
1900
3
A galvanometer has Ig = 0.5 mA and the ammeter must read up to 50 mA: what is n?
100
4
ℰ = 5 V, U = 4.2 V, I = 0.4 A. What is r (Ω)?
2
5
Why is it important never to short-circuit the source in the laboratory?
The large current heats the source and wires, risking fire or burns.