You are Here: Home >< Physics

Physics experiment - specific heat capacity of water watch

Announcements
1. Hi!
I be done an experiment to investigate the change in the specific heat capacity of water by changing the concentration of the water, accordingly. I've used a heating element to heat the water and I've insulated the beaker properly.

So, I read the current and voltage from the multimeters. So, I can find the energy supplied, by using
P= I V and then power = energy / time

We also know that E= mct
So are these equations equal?? Or will I need the efficiency of my system?!?

Thanks
Posted from TSR Mobile
2. (Original post by rishabharora)
Hi!
I be done an experiment to investigate the change in the specific heat capacity of water by changing the concentration of the water, accordingly. I've used a heating element to heat the water and I've insulated the beaker properly.

So, I read the current and voltage from the multimeters. So, I can find the energy supplied, by using
P= I V and then power = energy / time

We also know that E= mct
So are these equations equal?? Or will I need the efficiency of my system?!?

Thanks
Posted from TSR Mobile
How would you calculate the efficiency? I'd probably just insulate everything well and equate IVt = mcT
3. (Original post by lerjj)
How would you calculate the efficiency? I'd probably just insulate everything well and equate IVt = mcT
Maybe calculate the energy input and energy output?? Not exactly sure. But is the Ivt = mct a correct method?
4. (Original post by rishabharora)
Maybe calculate the energy input and energy output?? Not exactly sure. But is the Ivt = mct a correct method?
Should be, maybe use a for temperature to stop it getting confused with time, but yeah. Both equate to the energy the water has gained as heat.

My point about calculating efficiency is that you're already measuring the energy output in the form of how much the water heats up. Unless you have some very accurate way of working it out from theory, I don't think there's much you can do but assume that your experiment is 100% efficient.

5. So considering you are trying to find the specific heat capacity, chances are they want you to assume 100% efficiency, seeing as you would calculate the efficiency using the two above formulas, of which the value you are trying to find is unknown.
6. Yeah, so I'll equate the formulas and assume 100% efficiency

Posted from TSR Mobile

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: March 14, 2015
Today on TSR

Four simple steps to get an A*

Here's all you have to do

University open days

• University of East Anglia
All Departments Open 13:00-17:00. Find out more about our diverse range of subject areas and career progression in the Arts & Humanities, Social Sciences, Medicine & Health Sciences, and the Sciences. Postgraduate
Wed, 30 Jan '19
• Aston University
Wed, 30 Jan '19
• Solent University