physics

posted by .

A 8 V flashlight battery has an internal resistance of 1.7 Ω when new, and 8 Ω when old. Imagine this is a resistor in series with the battery mounted INSIDE the battery itself, which describes the chemical degradation of the battery with age. Calculate the voltage across a 14 Ω lamp (the load) when the battery is new. Express the answer with one decimal place.

  • physics -

    Rt = 1.7 + 14 = 15.7 Ohms.

    I = E/Rt = 8/15.7 = 0.51A,

    V = IRl = 0.51 * 14 = 7.1 Volts across
    lamp.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    A new "D" battery has an emf of 1.5 V. When a wire of negligible resistance is connected between the terminals of the battery, a current of 25 A is produced. Find the internal resistance of the battery. ________ Ω
  2. Physics

    What is the emf of a battery with a 0.15 Ω internal resistance if the battery delivers 1.5 A to an externally connected 5.0 Ω resistor?
  3. Physics

    A 5.0 Ω resistor, a 9.0 Ω resistor, and a 10.0 Ω resistor are connected in parallel across a 24.0 V battery. What is the equivalent resistance of the circuit?
  4. physics

    A 50 V battery has an internal resistance r. 1 A 50 V r 55 Ω 66 Ω internal resistance What is the value of r?
  5. Physics

    A 79.4-Ω and a 47.7-Ω resistor are connected in parallel. When this combination is connected across a battery, the current delivered by the battery is 0.296 A. When the 47.7-Ω resistor is disconnected, the current from …
  6. physics

    An old battery with an emf of 9.0 V has a terminal voltage of 7.8 V when it is supplying a current of 1.5 mA. What is the internal resistance of the battery?
  7. Physics

    I'm confused with this one, here's what i got 45.0 v/ 40.0Ω = 1.125 A is the answer b?
  8. physics

    Two 1.30-V batteries-with their positive terminals in the same direction-are inserted in series into the barrel of a flashlight. One battery has an internal resistance of 0.182Ω, the other an internal resistance of 0.139Ω. …
  9. physics

    when a battery is connected to a 100-Ω resistor, the current is 4.00 A. When the same battery is connected to a 449-Ω resistor, the current is 1.09 A. Find the emf supplied by the battery and the internal resistance of the …
  10. physics

    hen a battery is connected to a 100-Ω resistor, the current is 4.00 A. When the same battery is connected to a 449-Ω resistor, the current is 1.09 A. Find the emf supplied by the battery and the internal resistance of the …

More Similar Questions