Trouble Shooting

1: A wire connects by mistake between the circuit A and B. How does it affect the circuit?

2: A wire connects by mistake between the circuit A and B. How does it affect the circuit?

3: A wire connects by mistake between the circuit A and Bulb. How does it affect the circuit?

4: Connect a Multimeter and messure Voltage between A and B. What will the multimeter show?

5: Connect a Multimeter and messure Voltage between A and B. What will the multimeter show?