If a resistance is halved in value and the potential difference across it is tripled, then the ratio of the new current to the old one is

Assessment: JAMB UTME - Physics - 1995 Subject: Physics

Question 1 Report

If a resistance is halved in value and the potential difference across it is tripled, then the ratio of the new current to the old one is

1 : 6

1 : 3

2 : 1

6 : 1

Answer Details

\frac{V_{1}}{V_{2}}

=

\frac{I_{1} R_{1}}{I_{2} R_{2}}

$\frac{I_{1}}{I_{2}}$ V2 = 3V1 and R1 = 2R2

$\frac{V_{1}}{3 V_{1}}$ = $\frac{I_{1} \times 2 R_{2}}{I_{2} \times R_{2}}$

$\frac{I_{1}}{I_{2}}$ = $\frac{6}{1}$

Read lesson note on Current Electricity (JAMB)

Read lesson note on Simple A.C Circuits (JAMB)

Current Electricity

Simple A.C Circuits

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