Questions and Answers
Define the term mass.
It is the measure of the amount of substance contained by an object.
State the unit of measurement of mass.
Kilograms, symbol is kg.
Define the term force.
It is the push or pull required to change the motion of an object.
What is the unit of measurement of force?
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Define the term weight.
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At sea level, an object that has a mass of 1 kg exerts a force of (or weighs) about ___.
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What is the unit of measurement of weight?
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List three other forces besides gravity.
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Define electromagnetic force.
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Define strong nuclear force.
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Define weak nuclear force.
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Gravity is a factor in the ___ of an object.
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State the difference between mass and weight.
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Define the term work.
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Define the term energy.
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Define the term power.
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What is the unit of measurement for power?
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A charged battery contains:
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The rate of doing work is expressed in:
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Energy exists in two basic forms. They are:
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Define the term joule.
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What is the formula for work?
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What is the electrical and mechanical energy formula?
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What is the power equation formula?
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What is the electrical power formula?
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What is the electrical power formula if the resistance and current are known?
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What is the electrical power formula if the voltage and resistance are known?
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What is the approximate relationship of horsepower to watts?
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What is the electrical energy measurement formula?
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Electrical energy is measured by a unit called ___.
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What is the amount of energy used formula?
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To find the energy consumed:
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To find the energy used in megajoules:
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To find line and motor loss:
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What is the efficiency of the circuit formula?
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Accounting for conductor resistance, how are most loads hooked up in the field?
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List three types of losses that must be factored in when considering the efficiency of a motor circuit.
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The symbol used in a formula to represent the rate of energy dissipation in an electric circuit is P.
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Electric energy is equal to:
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An instrument that measures the power dissipated by a circuit must measure:
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The force due to gravity is called weight.
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One watt-second is called a joule. Therefore, 1 kWh is equal to:
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The symbol used to represent electrical power is:
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The SI symbol used to represent the unit of measurement for power in an electric circuit is P.
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Study Notes
Key Definitions
- Mass: Measure of substance in an object; expressed in kilograms (kg).
- Force: Push or pull needed to alter an object's motion; measured in newtons (N).
- Weight: Force of gravity acting on a mass; varies with gravitational pull, measured in newtons (N).
- Work: Application of force to change motion; measured in joules (J).
- Energy: Ability to perform work; also measured in joules (J).
- Power: Rate of doing work; symbolized as P and measured in watts (W).
Forces and Their Types
- Electromagnetic Force: Force between two electrical charges.
- Strong Nuclear Force: Holds protons and neutrons in an atom's nucleus, overcoming repulsion.
- Weak Nuclear Force: Acts between subatomic particles.
Key Equations
- Work Formula: W = f * d (where f = force, d = distance).
- Power Equation: P = e / t (power in watts, energy in joules, time in seconds).
- Electrical Power Formula: P = V * I (power in watts, voltage in volts, current in amperes).
- Efficiency Formula: %Efficiency = Pout / (Pout + Ploss) * 100.
Energy Forms and Measurements
- Kinetic Energy: Energy of motion.
- Potential Energy: Energy due to an object's position.
- Electrical Energy Measurement: kWh; calculated based on power and time (1 kWh = 3600 kJ).
Efficiency Considerations
- Common types of losses in motor circuits: windage, core losses, and friction.
- Line and Motor Loss Formula: P = I^2 * R.
Conversion Facts
- Energy used in megajoules: Multiply kWh by 3.6.
- Horsepower to watts conversion: 1 hp = 746 W (0.746 kW).
Measurement Instruments
- To assess power in a circuit, both current and voltage must be measured.
Common Misconceptions
- Weight is indeed the force due to gravity.
- One watt-second equals a joule, thus 1 kWh equates to 1000 watts times 3600 seconds.
Miscellaneous
- Series-parallel: Configuration used to offset conductor resistance in loads.
- Power Symbol: Represented by P in formulas, but SI unit for electric power is not symbolized as P.
Studying That Suits You
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Description
Explore key concepts related to work, energy, power, and efficiency with this flashcard quiz. Test your knowledge on fundamental terms such as mass, force, and their measurements. Ideal for students looking to strengthen their understanding of physics.
