No, in most cases you can not do this. Most of the time the connectors are not the same anyway, but even if they are, it is still not advisable. Many laptop computers run on slightly different voltages, and some use more amps than others. If you use the wrong voltage/amp rating, you could damage your notebook. If you know for a fact that the output voltage, amps and polarity are the same, and the connector fits, then you should be OK. If in doubt, don't do it without getting some assistance from a professional.
As long as the connector fits in to the computer correctly.
As long as your laptop power cord has a USB adapter or attachment on the end, yes.
Make sure the laptop computer is receiving power. (Is the cord plugged in correctly?). When the laptop battery is installed in the computer and it is properly plugged in to an AC outlet, check to see if the fuel gauge is showing a charge sign. If this does not fix the problem, the laptop battery, the power source in the laptop, or the AC power cord may be defective.
Dell laptop power cords are generally only compatible with Dell laptops, as each brand of laptop has its own specifications for batteries and power cords.
HP 402018-001 AC Adapter will charge your computer pretty fast.
power cord
You will need to use the power cord and/or the battery in order to turn the laptop on.
No, if it is a desktop power cord - which is no more than a few wires (no internal components). Yes, if you're talking about a laptop - most laptop power cords have a LED built in that will take power, beyond the necessary "no load" power used by the step down transformer and DC rectifying circuit.
If you are running off a battery, you do not need a power supply cord. Once your battery runs out, you will need to plug in with an appropriate cord that fits your brand of computer.
Laptop power supplies can certainly be purchased separately. If you lost only a detachable cord it is an inexpensive replacement, but if you lost a cord including the pwoer adapter "brick" it is more expensive.
A new laptop power chord can be purchased from your laptops manufacturer. You can also find the same model laptop power cord in electronic department stores, as well as online electronic stores.
Fix your laptop power cord that hasn't been supplying consistent power. some basic tools, electrical tape, and the perseverance that only a true cheapskate can muster. I performed this on my very own HP Pavilion's power cord and adapter.
An extension cord is a long power cord that plugs into an outlet and receives with an outlet. A computer cord just uses one long cable to transfer power to the computer from the outlet.