1. Using DMMs
Part 2

2. Resistance testing: OK for checking bulbs
Always confirms a good part or circuit
Good to identify a “bad” part
Tests the circuit under load
1 and 2
1 and 3
2 and 4
2 and 3

3. Ohm readings? 1 and 2 ohms 2 and 5 ohms .5 and 0 ohms No ohms
OL and 1 ohm
100 – 1000 ohms

7. Output when measuring ohms?
Less than a volt
More than a volt
Over 10 million ohms
None of the above

8. Reason circuit must be off when measuring resistance?
To avoid damaging the meter
So the meter’s fuse doesn’t blow
Because .7 volts can’t flow through 12 volts
Just to make life difficult

9. Measuring voltage How is the meter placed to measure voltage?
Why is the meter placed the way it is?
How does the meter affect the circuit?
Does meter resistance matter?

10. Meter internal resistance?
Less than an ohm
Less than 10 ohms
Less than 1000 ohms
At least 10,000 ohms
At least 1,000,000 ohms
At least 10,000,000 ohms
Infinite ohms

12. Why does the meter need high internal resistance?
To increase circuit current flow
To decrease circuit current flow
To not affect circuit current flow
None of the above

15. 12/10,000,000 =
amps
12/2 = 6 amps
Total amps =
amps
So the net affect on the circuit is nothing