Such conversions are often inefficient and/or expensive. It requires an external power supply or battery charger to convert AC into DC.
DC series motors run on DC power. Homes have AC power, not DC power. You could use DC motors in homes if you have a power supply or use a battery, but it is usually more cost effective to use an AC motor.
A DC motor is an electric motor that runs on direct current (DC) electricity. A DC motor is designed to run on DC electric power. Two examples of pure DC designs are Michael Faraday's homopolar motor (which is uncommon), and the ball bearing motor, which is (so far) a novelty. By far the most common DC motor types are the brushed and brushless types, which use internal and external commutation respectively to reverse the current in the windings in synchronism with rotation.
no you can't use dc motor to power hydro turbine ?
You can use a DC ammeter.
DC, unless you run an extension cord.
A DC generator is a DC machine that is driven by an external rotating force. It is constructed the same as a DC motor.
A laptop runs on DC. Either from the battery, or the external power supply, which converts AC power to DC.
everything
Such conversions are often inefficient and/or expensive. It requires an external power supply or battery charger to convert AC into DC.
12V DC & 2A output
A DC jack exists for the purpose of supplying direct current to a device from an external source, as opposed to the batteries inside the device. The external DC power would likely come from an AC to DC adapter that you plug into the wall. Such a jack can also work with car adapters too, provided it it converted to the correct voltage. So using an external source keeps you from using the batteries. With some equipment, that can charge the battery as well, but devices using disposable batteries are wired as to not charge the batteries.
A DC jack exists for the purpose of supplying direct current to a device from an external source, as opposed to the batteries inside the device. The external DC power would likely come from an AC to DC adapter that you plug into the wall. Such a jack can also work with car adapters too, provided it it converted to the correct voltage. So using an external source keeps you from using the batteries. With some equipment, that can charge the battery as well, but devices using disposable batteries are wired as to not charge the batteries.
A DC jack exists for the purpose of supplying direct current to a device from an external source, as opposed to the batteries inside the device. The external DC power would likely come from an AC to DC adapter that you plug into the wall. Such a jack can also work with car adapters too, provided it it converted to the correct voltage. So using an external source keeps you from using the batteries. With some equipment, that can charge the battery as well, but devices using disposable batteries are wired as to not charge the batteries.
What motor is NOT suitable for use as a DC machine?
the car use dc current dear
DC has no frequency.