Test Bank - Chapter 01 Q1: Power is defined as A. the measure of mechanical energy. B. the potential energy due to gravity. C. the rate at which work is performed. (Correct) D. the speed of atomic and molecular motion. Rationale: Power is a measure of the rate at which work is being performed. The formula P = W/J, where W = watts and 1 watt is equal to 1 J/s, expresses this. Joules are the international standard for expressing energy and work.
Q2: Work is said to be performed when A. an effort causes a change in the position of matter. (Correct) B. the amount of energy is measured joules. C. mechanical power is generated. D. the law of the conservation of energy is demonstrated. Rationale: Work is performed only when effort or outside forces produce a change in the position of matter.
Q3: The unit used to express the force of 1 N acting on a 1-kg object to move it 1 m is which of the following? A. Watt B. Joule (Correct) C. Kilowatt D. Kinetic energy (KE) Rationale: One joule is equal to the force of 1 N acting on 1 kg. A watt is equivalent to 1 J/s. A kilowatt is simply 1000 W. KE is energy an object possesses when it is in motion.
Q4: Power is expressed in which of the following units? A. Newtons B. Joules C. Ohms D. Watts (Correct) Rationale: Power is a measure of the rate at which work is being performed. Energy and work are measured in joules. One joule is the force of 1 N acting on a 1-kg object to move it 1 m. Ohms is the resistance an electrical circuit possesses.
Q5: The energy of a moving object is called
Mosby's Respiratory Care Equipment 12e Cairo Test Bank