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Yes, it's possible to have electrical receptacles and overhead lights on the same circuit. The reason is that lights typically use much less power than large appliances, so combining them won't overload your circuit. By doing this, you can distribute the power consumption throughout the breakers in your panel more efficiently, which can be helpful if you have a lot of different electrical devices in your home.

It’s possible to distinguish a positive black wire from a negative black wire if you know what type of circuit the wires are in. If it’s an alternating current (AC), then black wires are positive. If it’s a direct current (DC), then black wires are negative. 

Sometimes, a circuit has two black wires. In that case, the positive black wire will be solid black while the negative black wire will have a white stripe on it. If you’re still unsure, you can use a multimeter to check.

As a safety measure, you should always turn off the main breaker while operating your generator’s backup breaker. In addition, you should also switch off all appliance breakers so you don't have a power surge when the main breaker turns back on. And finally, turning off the main breaker prevents back-feeding, which endangers utility workers with the risk of electrocution. Back-feeding could also destroy the electrical circuits of your neighbors if they use the same power network.

Yes, electric-start snow blowers need to be plugged in to start, but you can unplug them and go once they’re up and running. Simply plug the snow blower into an outdoor outlet and press the start button. Once it starts, you can unplug it and use it freely. The idea for these types of snow blowers is to simplify the starting process from the typical pull-string starts.