Energy Efficiency
Give a definition of energy efficiency.
Energy efficiency is a measure of how much useful energy is transferred
What is Ohm's Law? With units
Voltage (Volts) = Current (Amps) * Resistance (Ohms)
What is the name of the boundary where two tectonic plates move away from each other?
Divergent boundary.
What is the term for the variable that you change in an experiment to test its effect on the dependent variable?
Independent variable.
Which country is known as the "Land of the Rising Sun"?
Japan
A decrease in energy use based primarily on reducing unnecessary waste of energy.
Energy Conservation
A simple circuit consists of a 12 V battery connected to a resistor of 4 Ω. Using Ohm's Law, calculate the current flowing through the circuit.
3 Amps
What type of plate boundary is formed when two plates move toward each other?
Convergent boundary.
Which type of error occurs due to inconsistencies in the measuring instrument or method, affecting the accuracy of your data?
Systematic error.
Who developed the theory of general relativity?
Albert Einstein.
The law of energy conservation tells about two main things to know about energy. Name them.
Energy can not be created or destroyed. Only transformed.
In a circuit with a 24 V battery and a resistor of 6 Ω, if the current is measured to be 4 A, what is the power dissipated by the resistor? Use the formula P = I² × R. Power is measured in Watts.
96 Watts
Which geological feature is commonly formed at a divergent boundary between two oceanic plates?
Mid-ocean ridge (e.g., the Mid-Atlantic Ridge).
What is it called when an experiment produces the same results under the same conditions over multiple trials?
Reliability.
What is the name of the first artificial satellite sent into space?
Sputnik 1.
Draw a diagram and calculate the efficiency of electrical motor (in %) if it loses 300 j of 1000 j total energy input as heat and sound.
Input 1000 j = 100%, energy loss 300 j = 30%, useful energy 1000-300=700 j = 70%.
Draw the circuit diagram for a series circuit that includes a 9 V battery, a 6 Ω resistor, and a 3 Ω resistor. Label all components clearly, including the battery, resistors, and wires.
Draw the 9 V battery (a pair of long and short lines representing the positive and negative terminals).
Connect the positive terminal of the battery to the first resistor (6 Ω).
From the first resistor (6 Ω), connect a wire to the second resistor (3 Ω).
Finally, connect the second resistor (3 Ω) back to the negative terminal of the battery.
Labeling:
The battery is marked as 9V.
The resistors are labeled as 6Ω and 3Ω.
Wires are connecting the components in series, with the flow of current shown from the positive terminal to the negative terminal of the battery.
Key Points:
The current flows through both resistors in sequence because it's a series circuit.
The total resistance is the sum of the individual resistances, which would be 6Ω + 3Ω = 9Ω.
What is the term for the region where one tectonic plate is forced under another at a convergent boundary?
Subduction zone.
If you measure the height of a plant multiple times and get similar results, but those results are different from the actual height, what concept does this describe?
Accuracy (the measurements are consistent, but not correct).
What is the smallest bone in the human body?
The stapes (or stirrup) bone in the ear.
A factory installs a new machine that uses 60% of its input energy for useful work, while the remaining 40% is lost as heat. If the machine receives 5000 J of input energy, how much energy is wasted, and how much is used for useful work?
Energy wasted: 40% of 5000 J = 2000 J
Useful energy output: 60% of 5000 J = 3000 J
Question: Draw a parallel circuit with the following components:
A 12 V battery
Two resistors: 4 Ω and 6 Ω
Label all components (battery, resistors, and wires).
Next, calculate the total resistance of the circuit using Ohm's Law (V = I × R), and then find the total current if the current through the 4 Ω resistor is 3 A.
Parallel Circuit Drawing: Correctly drawn, labeling the 12 V battery, the 4 Ω and 6 Ω resistors, and the wires.
Total Resistance: The total resistance of the parallel circuit is 2.4 Ω.
Total Current: The total current in the circuit is 5 A.
Which type of tectonic plate boundary results in earthquakes and is commonly associated with fault lines like the San Andreas Fault?
Transform boundary.
How can you increase the validity of an experiment when testing the effect of a single variable?
By controlling all other variables to ensure that only the independent variable is affecting the dependent variable.
What is the only continent without a desert?
Europe.