Recent content by Aleena753

Homework Statement What 3 materials is the cathode coated with, from which the electron originate? Homework Equations None The Attempt at a Solution From what I managed to find, I think some may be nickel and barium but I'm not sure.

Alright thank you for your help : )

I had an idea for finding the solution. I was thinking that I could find the total V and then divide it by the total current to find Req and then use that Req in the parallel circuit formula (1/Req= 1/R1 + 1/R2 + 1/R3) to find R3. As for the total voltage of the battery, I know to use V=IR but...

Homework Statement A battery with an emf of 60 V and an internal resistance (r) is connected to a 10 ohm external resistance. The power lost inside the battery is 50w. The same battery is then connected to a 4.0 ohm resistance. The power loss is 200w. What is the internal resistance of the...

So the current for the equivalent resistance of R1 and R2 would be the total current of the circuit with the current of the third resistor subtracted right?

I had an idea for finding the solution. I was thinking that I could find the total V and then divide it by the total current to find Req and then use that Req in the parallel circuit formula (1/Req= 1/R1 + 1/R2 + 1/R3) to find R3. As for the total voltage of the battery, I know to use V=IR but...

Homework Statement Three resistors are connected as shown in the diagram. If the current from the power supply is 250 mA and the current through R3 is 54 mA, what is the resistance of R3? Homework Equations 1/Req= 1/R1 + 1/R2 +1/R3 V=IR The Attempt at a Solution First I used the parallel...