# Resistors

Discussion in 'Electronics Homework Help' started by Samuel2100, Sep 14, 2016.

1. ### Samuel2100

1
0
Sep 14, 2016
hey,

What is the total power loss if 2 k and 1 k parallel-connected resistors have an IT of 3 mA?

A. 6 W
B. 36 W
C. 6 mW
D. 36 mW

cheers,

sam

Last edited: Sep 14, 2016
2. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

25,482
2,830
Jan 21, 2010
What formulae do you have for calculating power?

Do you have one involving current and resistance?

3. ### Harald KappModeratorModerator

11,306
2,588
Nov 17, 2011
You have several ways to calculate this, once you have the equations at hand as asked by Steve.
• calculate the equivalent total resistance and from that the total power using the known current IT
• calculate the distribution of the total current IT among the parallel resistors, from that calculate power dissipation within each resistor, then add up partial results

4. ### Colin Mitchell

1,417
313
Aug 31, 2014
As you get more advanced, you will know that the current will flow in the two resistors such that twice the current will flow in the 1k resistor.
But it is much easier to have a big block of chocolate and cut it into 3 pieces. I get twice as much as you.
This means you can work out in your head, the current through each resistor.
Now use the formula that states power is . . . . . . . . . . for the 1k and power is: . . . . . for the 2k.
Then add the two values together.

5. ### Herschel Peeler

401
65
Feb 21, 2016
First find total resistance.  