Electric Circuits
A constant current source supplies a electric current of 300 mA to a load of 1 KΩ. When the load changed to 100 Ω, the load current will be

 3 A.
 30 mA.
 100 mA.
 300 mA.

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Electric Circuits
Pure metal generally have

  high conductivity and low temperature coefficient.
  low conductivity and zero temperature coefficient.
  high conductivity and large temperature coefficient.
  low conductivity and high temperature coefficient.

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