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How are batteries connected together to obtain more current capacity?

A way of connecting batteries together to provide more current is to connect them in parallel. This allows more capacity at the same voltage. If the batteries were connected in series the voltage would be increased.


What happen when ammeter connected in parallel?

an ideal ammeter has zero or negligible resistance when this is connected in series no effective resistance would be added in the circuit so that the value of curret that we get is exactly of the circuit only. but when the ammeter is connected in parllel as it has zero resistance , the resistor to which it is connected in parllel gets shorted and due to his the effective resistance of the circuit is changed and so the effective current ... due to this the w=value measured by the ammeter would be different (incresed due to dec. in effective resistance)


When an ammeter is connected in a circuit which terminal of the battery must be connected to the positive terminal of the ammeter?

The positive terminal of the battery would be connected to the positive terminal of the ammeter. The load would then be connected between the two negative terminals, positive side of the load being connected to the negative side of the ammeter.


What would happen if the lead of your voltmeter were connected backward?

A digital voltmeter will read negative voltage, if connecting backward. If the meter is an analogue type, the needle will go backwards and dip below the 0 on the scale.


Assume the triac of an ac output module fails in the shorted state how would this affect the device connected to this ouput?

If the triac of an ac output module fails in the shorted state, the device connected to the output would behave the same as if it had been connected directly to the ac power supply. It would run at full power and it would not be controllable.