Engineering Board Exam Reviewer · Ohm's Law · medium

A 12 V battery with internal resistance 0.4, is connected to a 5.6, load. What current flows?

  1. 2 A
  2. 2.14 A
  3. 30 A
  4. 1.2 A

Answer

A. 2 A

Solution

I=E/R+r=12/5.6+0.4=2 A.

More Ohm's Law questions

  1. A battery of emf 12 V and internal resistance 0.5, delivers 2 A to a load. What is the terminal voltage?
  2. A resistor draws 20 mA at 6 V and 50 mA at 15 V. Find its resistance.
  3. The voltage across a resistor is tripled and, at the same time, its resistance is halved. By what factor does the current change?
  4. A 4.7 k resistor carries 2.5 mA. What is the voltage across it?
  5. In the circuit shown, the source is 36 V and the resistor is 9, . What does the ammeter read?
  6. In the circuit shown, the source is 12 V and the resistor is 4, . What does the ammeter read?
  7. For a fixed voltage, if the resistance in a circuit is halved, the current
  8. If the voltage across a fixed resistor is tripled, the current is
  9. A resistor draws 2 A from a 120 V source. If the source voltage falls by 10%, what current will flow (resistance unchanged)?
  10. What voltage is needed to drive 60 mA through a 330, resistor?

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