physics (thxs again)

Thank you for the help :)

A certain sample carries a current of 4A when the potential difference is 2V and a current of 10A when the potential difference is 4V. This samples is:
a) obeys ohm's law
b) has a resistance of 0.5 ohms at 1V
c) has a resistance of 2.5 ohms at 1V
d) has a resistance of 2.5ohms at 2V
e) does not have a resistance

I treated each pathway separately so I have
R= V/I = (2/4)= .5
R= V/I= (4/10) = .4
The answer says that it is B. I am not quiet seeing how they get that answer.

An certain resistor dissipates electrical energy at a rate of 0.5 W when connected to a 3V potential difference. When connected to a 1V potential difference, the rate of electrical dissipation:
a).5 W
B) .167 W
C) 1.5W
D) .056W
E) none of these

I am little unsure about how to go about this problem. The main equation I got was P= V^2/R. The question seems to only want power.



Pm the first, there is no correct answer.

On the second, Power= v^2/resistance so as voltage decreases by 1/3, power decreases by 1/9. One-ninth of .5 watts is ...

  1. 👍 0
  2. 👎 0
  3. 👁 448
asked by susan

Respond to this Question

First Name

Your Response

Similar Questions

  1. electromagnetic

    Plane x = 10 carries current 100 mA/m along az while line x = 1, y = —2 carries filamentary current 20π mA along az Determine H at (4, 3, 2). pls i need it for my exam

    asked by ASB on October 31, 2014
  2. physics

    Two straight and parallel wires of length 1.0 m carry a current — the first carries a current of 9.0 A while the other wire carries a current of 4.0 A. What distance must separate the two straight and parallel copper wires if

    asked by grey on June 9, 2014
  3. Physics

    Two long parallel wires separated by a distance, d, carry currents in opposite directions. If the left-hand wire carries a current i/2, and the right-hand wires carries a current i, determine where the magnetic field is zero.

    asked by Jessica on October 20, 2011
  4. Physics

    One long wire carries current 26.0 A to the left along the x axis. A second long wire carries current 68.0 A to the right along the line (y = 0.280 m, z = 0). Where in the plane of the two wires is the total magnetic field equal

    asked by Emily on August 15, 2013
  5. physics

    Two very long, straight, parallel wires carry currents that are directed perpendicular. Wire 1 carries a current I1 into the page (in the -z direction) and passes through the x axis at x = +a. Wire 2 passes through the x axis at x

    asked by Rachel on April 9, 2011
  6. physics

    Two insulated wires, each 2.70 m long, are taped together to form a two-wire unit that is 2.70 m long. One wire carries a current of 7.00 A; the other carries a smaller current I in the opposite direction. The two wire unit is

    asked by Dee on February 26, 2014
  7. physics

    The emf of a battery is equal to its terminal potential difference: A) under all conditions B) only when the battery is being charged C) only when a large current is in the battery D) only when there is no curent in the battery E)

    asked by susane on March 27, 2007
  8. science

    If Wire A has a poterntial difference of 50V across it and carries a current of 2A. Wire B has a potential difference of 100V across it and also carries a current of 2A. Compare the resistances, rate of flow of charge, and rate of

    asked by ann on October 30, 2012
  9. Physics

    A long solenoid has 1400 turns per meter of length, and it carries a current of 2.0 A. A small circular coil of wire is placed inside the solenoid with the normal to the coil oriented at an angle of 90.0˚ with respect to the axis

    asked by Elle on October 19, 2014
  10. Physics - Current Loop

    A current loop in a motor has an area of 0.85 cm^2. It carries a 240 mA current in a uniform field of 0.62 T. What is the magnitude of the maximum torque on the current loop?

    asked by Robert on March 7, 2011
  11. College Physics

    A very long wire carries an I1 = 7.80 A current along the x axis and another long wire carries an I2 = 5.13 A current along the y axis. (I2 is directed upward on the y axis, and I1 is directed to the right on the x axis) What is

    asked by Amanda on February 23, 2014

More Similar Questions