The electromotive force of the power supply is 3V, the internal resistance is 0.1, and the external resistance is 1.4

The current is 3V divided by 0.1 + 1.4 = 2A
The terminal voltage is 3-2 * 0.1 = 3-0.2v = 2.8V

In the parallel circuit, if the power supply is short circuited, will the consumer of the other branch still work

Because the parallel circuit does not allow short circuit, any one of the short circuit, the circuit will all have a short circuit, that is, the power circuit, at this time not only the electrical appliances can not work, and will damage the power supply

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