about 2.5 volts
If you mean - can you run a 220v device on 120v where the 220v device needs that level of voltage to operate correctly then the answer is no. Even disregarding the frequency difference which some devices aren't affected by, the voltage difference is too great. Some devices these days, such as phone chargers, laptop power supply units etc will run happily on a voltage range from 100v up to 240v (read the label first) but they are the exception. The question is somewhat ambiguous and needs more information.
To answer this question the voltage of the motor is needed.
2.7 x 10^-3
It is generally safe to run a 4.3V device with a 5V power adapter, as the device should only draw the amount of voltage it is designed for. However, there is a slight risk of damaging the device if the voltage is consistently higher than the recommended level.
Electric current, but the voltage required depends on the electrical standards of the country you are in.
No, a 240 volt device runs on 240, and a 120 volt device runs on 120. Attempting to run a device on incompatible voltage results in damage.
A parallel circuit can run several devices using the full voltage of the supply, varying the current to the need of each device. If one device fails, the others will continue running normally. If the device shorts, the other devices will receive no voltage, preventing overload damage.A series circuit divides the supply voltage among the devices with a consistent current. If one device fails, all other devices in the circuit will either fail to receive voltage or receive too much voltage and become damaged in the case of a short.An advantage of parallel circuits is increasing the power rating of the circuit and reducing the resistance.
No. The voltage rating is the same, but the lower current rating on the 400ma power supply might cause the voltage to drop way below 12 volts, and on some devices a lower voltage than it is rated for will cause it damage.
To answer this question a voltage must be stated.
Most likely, yes. If your device requires 12 volt and draws 1 Amp of current, a 12 volt power supply will give the required voltage and will be able to supply the 1 amp of current it needs to run. A power supply that supplies a little more voltage might also work but depending on the device may cause the device to fail sooner. Much more than 12 volts will most likely destroy the device and result in a burning smell and smoke. A power supply for less than 12 volts may fail to power the device or may make it run slower. This would be like using a battery in a device and as the battery gets weaker, it supplies less voltage and the device slows down or a flashlight get dimmer till it stops working. A 1.5 amp power source is capable of delivering 1.5 amp of current to the device. If the device need less (only 1 amp), it still gets the amount it needs to function. If the power supply was rated at 10 A or 100 A, the device will still only use 1 A to function. If the power supply were rated at less than 1 amp. The device might not get enough current to run.
Not much, but it depends on the load and the cooling.
Yes, most leds will run on a 6v battery. Just look at the required voltage and make sure you don't exceed the maximum voltage. If the voltage is to high, find the correct resistor.