Recent content by qim

Thanks! qim

Thanks. But now I get 0.004 which is 4 litres. It seems too little

I understand that the volume of a pipe is the circle pi x r (sq) x height I have worked out the volume of water inside a pipe running from the shower to the boiler (cold water that will run through the tap before the hot water arrives) and it does not make sense. The pipe is 22 mm; the...

Thank you all. I have a builder coming in today to have a look at it, but any more scientific explanations/solutions would be welcome. qim

Thanks. It makes sense. However, there is another toilet with another vent and in that one I do not get the problem. I wonder why. Besides, it is a large apartment and I would have thought that air could be replenished from other areas (i.e. opening, closing doors) qim

Take two pipes close together on a roof chimney. One comes from the fireplace; the other is a vent from a toilet far away from the fireplace. The vent works fine and draws air when the fireplace is not burning wood. When it does there is a downdraught carrying smells (gases: carbon monoxide)...

"When applied for a few minutes after a potential difference is applied, it is observed that the current through the specimen increases substantially although the applied potential difference remains constant. Explain why the current should increase in this way." Could I be correct in...

Thanks Njorl But what am I to make of the statement that the equation should only work for resistors made of resistance wire? That's the bit I could not understand. Thanks qim

I have a question: A pencil "lead" is made from non-metallic material which has a resistivity, at room temperature, of 4.0 x 10^-3 m. A piece of this meterial has a length of 0.15 m and a diameter of 1.40 x 10^-3 m. Show that the resitance of this specimen is 390 Ohm. ----- Well...

Thanks Doug "What's that?", you probably heard me say... Yes, I got it, thanks very much. qim

Hi Jim Thanks, the penny is dropping... I have been given the voltage and the resistances So I guess I can work out the total resistance and then use P = V^2/R and from there P = V/I > I = V/P Just thinking aloud but I would be grateful if you could confirm that I am on the right...

If I have a question asking to calculate the current being drawn from a battery can I, or rather should I, give an answer in Ohms? I hate electricity... Thanks and a Happy New Year to you all. qim