Engineering Board Exam Reviewer · Voltage, Current and Resistance · medium

A 12 V battery is rated 60 Ah. For how many hours can it supply a steady 5 A?

  1. 12 h
  2. 300 h
  3. 0.083 h
  4. 60 h

Answer

A. 12 h

Solution

t= capacityI= 60 Ah5 A=12 h.

More Voltage, Current and Resistance questions

  1. A resistor has color bands yellow, violet, brown, gold. What is its resistance?
  2. A copper coil has a resistance of 100, at 20° C. Find its resistance at 70° C (temperature coefficient of copper =0.00393/° C at 20° C).
  3. A copper wire has a resistance of 12, . A second wire of the same length and material has twice the diameter. What is its resistance?
  4. Find the resistance of a copper wire 100 m long with a cross-sectional area of 2 mm2 (resistivity of copper =1.72×10-8, · m).
  5. Approximately how many electrons pass a point each second when the current is 2 A?
  6. A 5 A current flows through a wire of resistance 0.2, . What is the voltage drop along the wire?
  7. A 10 k potentiometer has its wiper set 30% of the way from one end. What is the resistance between the wiper and that end?
  8. A 1 k resistor has a 5% tolerance. Between what two values can its actual resistance lie?
  9. A resistor has color bands red, red, orange, silver. What is its value and tolerance?
  10. A resistor has color bands brown, black, red, gold. What is its value and tolerance?

All Voltage, Current and Resistance questions