Question

If a copper wire is stretched to make it 0.1% longer then resistence is

Answer 1

v=w/q

v=ir (Ohms Law)

Q=ne (n = no. of electrons)(e= charge of an electron)

r=p l/a (p=resistivity)

//calculate power

p=vi ( Generally not used)

p=i2r ( used in series generally as current is constant in series)

p=v2 /r ( used in parallel generally as voltage is constant in parallel)

p=vi ( Generally not used)

p=i2r ( used in series generally as current is constant in series)

p=v2/r ( used in parallel generally as voltage is constant in parallel)

//calculate work done or energy

W=vit ( Generally not used)

W=i2rt ( used in series generally as current is constant in series)

W=v2t/r ( used in parallel generally as voltage is constant in parallel)