Applied Technology Flashcards

Ohm's Law relates voltage, current, and resistance. Which equation correctly states Ohm's Law?

Answer: Voltage = Current × Resistance

Ohm's Law states V = I × R, meaning voltage equals current (in amperes) multiplied by resistance (in ohms).

Pascal's Law states that pressure applied to an enclosed fluid at rest is:

Answer: Transmitted equally in all directions throughout the fluid

Pascal's Law states that pressure applied to any part of an enclosed fluid is transmitted undiminished in all directions throughout the fluid.

A wedge used to split wood is an example of which simple machine?

Answer: Inclined plane

A wedge is a double inclined plane — it converts a downward force into outward splitting forces along its sloped surfaces.

A step-up electrical transformer increases output voltage by having:

Answer: More turns on the secondary coil than the primary

A step-up transformer has more turns on the secondary coil; voltage increases in proportion to the ratio of secondary to primary turns.

A screw has a pitch of 0.25 inches (distance advanced per revolution) and is turned by a wrench with a 5-inch handle. What is the mechanical advantage?

Answer: 125.7

MA of a screw = circumference of handle rotation ÷ pitch = (2π × 5) ÷ 0.25 ≈ 31.4 ÷ 0.25 ≈ 125.7.

When springs are connected in series (end to end), the total spring constant of the system compared to a single spring:

Answer: Decreases — combined springs are easier to stretch

Springs in series share the load, making the system more flexible (lower spring constant) than any individual spring alone.

In a belt-and-pulley system, a 4-inch drive pulley is connected to a 12-inch driven pulley. If the drive pulley spins at 900 RPM, what is the speed of the driven pulley?

Answer: 300 RPM

Speed ratio is inversely proportional to pulley size: driven speed = 900 × (4/12) = 300 RPM.