Physics

an electric cell of internal resistance of 0.5Π deliver a a current of 2.0A when resistance of 3Πis connected across it. the emf of the cell is

  1. 👍 0
  2. 👎 0
  3. 👁 31
asked by Poppy
  1. emf=I(Rint+R)=2.0*(.5+3)=7volts

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    The internal resistance of a dry cell increases gradually with age, even though the cell is not used. The emf, however, remains fairly constant at 1.5 V. Dry cells must be tested for age at the time of purchase by connecting an

    asked by J on February 12, 2008
  2. Math

    Amperes (abbreviated amp) measure the strength of electric current. An ohm is the unit of electrical resistance. In an electric circuit, the current varies inversely as the resistance. If the current is 24 amps when the resistance

    asked by Haylie on May 14, 2012
  3. math

    Find the minimum number of cells connected in two rows in parallel required to pass a current of 6 A through an external resistance of 0.70 ohms. Take the emf of each cell as 2.1 volts and internal resistance of each cell as 0.5

    asked by Cora on June 30, 2015
  4. Rohan Khan

    A person with body resistance between his hands of 10KÙ accidently grasps the terminal of a 14-KV power supply. (a) If the internal resistance of the power supply is 2000Ù, what is the current through the person’s body? (b)

    asked by Rohan Khan on June 10, 2011
  5. math

    a. The power of an electric appliance is given by the formula P=I^2R, where I is the current and R is resistance. Use this information to explain how you can use radicals to determine the current if the power and the resistance is

    asked by Steve on September 19, 2016
  6. algebra

    If the voltage V, in an electric circuit is held constant,the current,I,is inversely proportional to the resistance,R. If the current is 490 milliamperes when the resistance is 5 ohms,find the current when the resistance is 35

    asked by jitka on December 6, 2010
  7. 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. When

    asked by Annie on February 6, 2015
  8. Physics

    The readings on a high resistance voltmeter, when a cell is connected across it, is 2.2 V . When the terminals of cell are also connected to a resistance of 5 ohm the voltmeter reading drops the 1.8 V. Calculate the internal

    asked by Hrishav on January 20, 2018
  9. physics

    a cell of emf 10v and internal resistance 2ohms is connected in series with an ammeter resistance 0.5ohms and a load of resistance 7ohms. Calculate (A) the potential difference across its terminal (B)the voltage drop

    asked by benjamin on May 21, 2015
  10. physics

    when you connect an unknown resistor across the terminals of a 1.50 V AAA battery having a negligible internal resistance, you measure a current of 18.0 mA flowing through it .A)what is the resistance of the resistor. B) if you

    asked by brad on May 11, 2010
  11. physics

    power supply has an open-circuit voltage of 39.0 V and an internal resistance of 2.00 Ù. It is used to charge two storage batteries connected in series, each having an emf of 5.50 V and internal resistance of 0.300 Ù. The

    asked by Anonymous on March 6, 2012

More Similar Questions