For a constant resistance, how is the voltage related to the current? a) voltage is inversely proportional to current, so when the voltage doubles, the current is cut in half. b) voltage is directly proportional to current, so when the voltage doubles, the current is cut in half. c) voltage is inversely proportional to current, so when the voltage doubles, the current doubles. d) voltage is directly proportional to current, so when the voltage doubles, the current doubles.

Option (D) is the correct answer.

Explanation:

According to the ohm's law, the voltage across a resistor is directly proportional to the product of current and resistance.

Mathematically,     V = I × R

where,      V = voltage

                 I = current

                 R = resistance

Therefore, it means voltage is directly proportional to the current. So, if resistance is constant then with increase in voltage there will also occur increase in the current.

Thus, we can conclude that for a constant resistance, voltage is directly proportional to current, so when the voltage doubles, the current doubles.

a longitudinal wave moves energy that is to the direction of the wave’s movement. - true

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