A device seems to me to be more complex than a component, at least there are components that are very simple (a resistor is a component).
A device might be able to work on it's own but a component probably needs some other stuff to work.
A computer component would be part of the computer itself. Devices can be separate to a computer and just connected to it.
gtg
A component is a part of something - usually a necessary part.A peripheral is an adjunct, an accessory, not something required.
A voltmeter is used to measure electric potential, which is also known as voltage. It is a device that is typically connected in parallel to the circuit or component being tested to measure the potential difference between two points.
In electrical wiring, the line refers to the incoming power supply, while the load refers to the device or component that uses the power. The line carries the electricity to the load, where it is used to power the device.
A voltmeter is a device used to measure the electrical potential difference between two points in a circuit. It works by connecting the voltmeter in parallel with the component or circuit being measured. The voltmeter then displays the voltage difference in volts, allowing the user to determine the potential difference between the two points.
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Potential meter is voltage control device and rheostate is current control device. it is a basic difference.
"http://wiki.answers.com/Q/What_is_the_difference_between_a_risk-bearing_device_and_a_security_device"
No, a voltmeter measures the difference in electric potential between two points in a circuit, which is called voltage. It does not measure the energy converted by a component, but rather the electrical potential difference across that component.
hardrive nothing but it is secondary storage device,And Ram is a primary storage device
hardrive nothing but it is secondary storage device,And Ram is a primary storage device