Question

A block in the shape of a rectangular solid has a cross-sectional area of 5.24 cm2 across its width, a front-to-rear length of 15.7 cm, and a resistance of 977 Ω. The block's material contains 4.45 × 1022 conduction electrons/m3. A potential difference of 39.9 V is maintained between its front and rear faces. (a) What is the current in the block

Answer 1

Answer:

The current through the block is 40.8mA

Explanation:

For question a we can apply the macroscopic form of Ohm's law:

$I=\frac{V}{R}$

where:

V= potential difference

R= The resistance of the block

substituting the values on the formula we have:

$I=\frac{39.9V}{977 \Omega}\\\\I=40.8mA$