circuits + ohms law Flashcards
(28 cards)
What is Ohm’s law?
Ohm’s law is a scientific law which demonstrates that the current through a conductor between two points is directly proportional to the voltage across the two points.
Who discovered Ohm’s law?
German physicist Georg Ohm (1789-1854) discovered the relationship between voltage, current, and resistance in an electric circuit.
What is the formula for Ohm’s law?
The formula for Ohm’s law is V = I x R, where V is voltage, I is current, and R is resistance.
What happens to voltage and current in a fixed resistor?
Increasing the current through a fixed resistor increases the voltage across it, while reducing the voltage reduces the current flowing through it.
What is an ohmic resistor?
Conductors with a fixed resistance are known as ohmic resistors.
What is a voltmeter?
A voltmeter is a device that measures the potential difference (voltage) across two points in a circuit.
How do you measure voltage with a voltmeter?
To measure voltage, the circuit must be completed, and the voltmeter should be connected so that the two probes are at the two points where the voltage will be measured.
What are non-ohmic conductors?
Non-ohmic conductors, such as LEDs, have resistance that changes depending on the current passing through them.
What is the independent variable in an experiment?
The independent variable is the factor that is changed or controlled in a scientific experiment to test its effects on the dependent variable.
True or False: The dependent variable is what you measure in an experiment.
True
Fill in the blank: A __________ circuit allows current to flow, while a __________ circuit does not.
closed; open
What do you need in a graph?
Drawn with pencil and ruler, labelled axis, title, plot with x’s
What is STAPL (SPLAT)?
S - scale, t - title, a - axis (labelled), p - plot (with x’s and accurately), l - line (of best fit)
What is the primary source of energy for solar power?
The sun.
True or False: Wind energy is generated using turbines that convert kinetic energy into electrical energy.
True.
Fill in the blank: In a graph showing renewable energy sources, the __________ typically represents the percentage of total energy production.
y-axis.
Which of the following is NOT a type of renewable energy? A) Solar B) Wind C) Natural Gas D) Hydro
C) Natural Gas.
What trend might you expect to see in a graph depicting the growth of renewable energy usage over the last decade?
An upward trend indicating increased usage.
What is the primary purpose of scientific communication?
To convey scientific arguments and findings effectively using evidence.
True or False: Scientific arguments should be based solely on personal opinion.
False
Fill in the blank: Scientific language is characterized by precision and ______.
clarity
What type of evidence is considered the strongest in scientific arguments?
Empirical evidence obtained through experiments and observations.
Multiple Choice: Which of the following is NOT a component of scientific arguments? A) Hypothesis B) Evidence C) Personal beliefs D) Conclusion
C) Personal beliefs
Define ‘scientific terminology’.
Specialized vocabulary used in scientific discourse to ensure accuracy and clarity.
