Class X

  A galvanometer is used to
  1. Measure potential difference
  2. Detect direction of current
  3. Measure amount of current flowng
  4. Measure electric power of the circuit
  While performing the experiment to study the dependence of current on potential difference ,if the circuit used to measure the current and voltage is kept in on position for a longer time ,then
  1. Voltmeter reading will change
  2. Ammeter reading will change
  3. The resistor will get heated up changing the value of ?R?
  4. All of the above
The voltmeter is always connected in _________ across the points between which the potential difference is to be measured.
  1. series
  2. parallel
  3. either series or parallel
  4. none of these
. Current is measured in Amperes using _______.
  1. work done, 1J(1 Joule)
  2. Ohm-meter (Ωm)
  3. sum, R = R1 + R2 + R3 + ...
  4. ammeter
  A voltmeter is used to measure
  1. Potential difference
  2. Eelectric current
  3. Electric power
  4. Resistance
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