A voltmeter with resistance RVRVR_V is connected across the terminals of a battery of emf EEEMF and internal resistance rrr. Find the potential difference VmeterVmeterV_meter measured by the voltmeter.

V = E - Ir

Explanation:

According to ohms law which states that the current I passing through a metallic conductor at constant temperature is directly proportional to the potential difference V across its ends. Mathematically,

V = IR... (1)

or E = IRt ... (2)

where;

V is the potential difference across the resistance R

E is the source voltage known as the electromotive force

I is the current

Rt is the effective resistance.

If a voltmeter with resistance Rohms is connected across emf E and internal resistance r, the external resistance and internal resistance will be in series with each other and their equivalent resistance Rt = R+r... (3)

Substituting equation 3 into equation 2 will give;

E = I(R+r)

E = IR+Ir ... (4)

Note that from equation 1, the potential difference V = IR

Substituting V = IR into equation 4 will result into;

E = V+Ir

V = E-Ir

The fore the potential difference V measured by the voltmeter is;

V = (E-Ir) meters

pecialized keyboards

the answer is false. this is because for ice to melt, it requires latent heat of melting. latent heat means heat energy required to change phase without any increase in temperatures. therefore, the ice will take energy from the environment to melt hence atmospheric temperatures will reduce.