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Competencies
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Describe using a diagram charging by rubbing and charging by induction.
Explain the role of electron transfer in electrostatic charging by rubbing.
Describe experiments to show electrostatic charging by induction.
State that there are positive and negative charges, and that charge is measured in coulombs.
Predict charge distributions, and the resulting attraction or repulsion, in a system of charged insulators and conductors.
Calculate the net electric force on a point charge exerted by a system of point charges.
Describe an electric field as a region in which an electric charge experiences a force.
Draw electric field patterns due to systems with isolated point charges.
Use in calculations the relationship between the electric field and the electric force on a test charge.
Calculate the electric field due to a system of point charges using coulomb’s law and the superposition principle.
Predict the trajectory of a point charge in a uniform electric field.
Calculate electric flux.
Use gauss’s law to infer electric field due to uniformly distributed charges on long wires, spheres, and large plates.
Solve problems involving electric charges, dipoles, forces, fields, and flux in contexts such as, but not limited to, systems of point charges, classical models of the atom, electrical breakdown of air, charged pendulums, control of electron and proton beams, electrostatic ink-jet printers.
Relate the electric potential with work, potential energy, and electric field.
Evaluate the potential at any point in a region containing point charges.
Determine the electric potential function at any point due to highly symmetric continuous- charge distributions.
Infer the direction and strength of electric field vector, nature of the electric field sources, and electrostatic potential surfaces given the equipotential lines.
Infer the distribution of charges at the surface of an arbitrarily shaped conductor.
Calculate the electric field in the region given a mathematical function describing its potential in a region of space.
Perform an experiment involving electric fields and equipotential lines and analyze the data – identifying and analyzing discrepancies between experimental results and theoretical expectations when appropriate.
Solve problems involving electric potential energy and electric potentials in contexts such as, but not limited to, electron guns in crt tv picture tubes, conditions for merging of charge liquid drops, and van de graaff generators.
Deduce the effects of simple capacitors (e.g., parallel-plate, spherical, cylindrical) on the capacitance, charge, and potential difference when the size, potential difference, or charge is changed.
Calculate the equivalent capacitance of a network of capacitors connected in series/parallel.
Determine the total charge, the charge on, and the potential difference across each capacitor in the network given the capacitors connected in series/parallel.
Determine the potential energy stored inside the capacitor given the geometry and the potential difference across the capacitor.
Predict the effects on the final potential difference and change in potential energy of a capacitor when either the geometry or charge is changed.
Determine the energy density and the electric field inside a capacitor with a given configuration.
Describe the effects of inserting dielectric materials on the capacitance, charge, and electric field of a capacitor.
Solve problems involving capacitors and dielectrics in contexts such as, but not limited to, charged plates, electroscopes, batteries, camera flash-lamps, geiger counters, and coaxial cables.
Distinguish between conventional current and electron flow.
Apply the relationship charge = current x time to new situations or to solve related problems.
Relate the drift velocity of a collection of charged particles to the electrical current and current density.
Describe the effect of temperature increase on the resistance of a metallic conductor.
Describe the ability of a material to conduct current in terms of resistivity and conductivity.
Apply the relationship of the proportionality between resistance and the length and cross-sectional area of a wire to solve problems.
Differentiate ohmic and non-ohmic materials in terms of their i-v curves.
Define electromotive force (emf) as the work done by a source in driving a unit charge around a complete circuit.
Differentiate electromotive force (emf) of a source and potential difference (pd) across a circuit.
Use the the relationship r = v/i to solve problems.
Given an electromotive force (emf) source connected to a resistor, determine the power supplied or dissipated by each element in a circuit.
Describe the physiological effects of electrical shock; electrical hazards; safety devices and procedures.
Solve problems involving current, resistivity, resistance, and ohm’s law in contexts such as, but not limited to, batteries and bulbs, household wiring, selection of fuses, and accumulation of surface charge in the junction between wires made of different materials.
Operate devices for measuring currents and voltages.
Plan and perform an experiment involving ohmic and non-ohmic materials and analyze the data – identifying and analyzing discrepancies between experimental results and theoretical expectations when appropriate.
Draw circuit diagrams with power sources (cell or battery), switches, lamps, resistors (fixed and variable) fuses, ammeters and voltmeters.
Evaluate the equivalent resistance, current, and voltage in a given network of resistors connected in series and/or parallel.
Calculate the current and voltage through and across circuit elements using kirchhoff’s loop and junction rules (at most 2 loops only).
Describe the initial, transient, and steady state behavior of current, potential, and charge in a capacitor that is either charging or discharging.
Solve problems involving the calculation of currents and potential differences in circuits consisting of batteries, resistors, and capacitors.
Plan and perform experiment involving batteries and resistors in one or more electric circuits and analyze the data.
Describe the interaction between poles of magnets.
Differentiate electric interactions from magnetic interactions.
Evaluate the total magnetic flux through an open surface.
Explain why the magnetic flux on a closed surface is zero.
Draw the magnetic field pattern around (1) a bar magnet, and (2) between the poles of two bar magnets.
Describe the motion of a charged particle in a magnetic field in terms of its speed, acceleration, cyclotron radius, cyclotron frequency, and kinetic energy.
Evaluate the magnetic force on an arbitrary wire segment placed in a uniform magnetic field.
Evaluate the magnetic field vector at a given point in space due to a moving point charge, an infinitesimal current element, or a straight current-carrying conductor.
Calculate the magnetic field due to one or more straight wire conductors using the superposition principle.
Calculate the force per unit length on a current carrying wire due to the magnetic field produced by other current-carrying wires.
Evaluate the magnetic field vector at any point along the axis of a circular current loop.
Calculate magnetic fields for highly symmetric current configurations using ampere’s law.
Solve problems involving magnetic fields, forces due to magnetic fields and the motion of charges and current-carrying wires in contexts such as, but not limited to, determining the strength of earth’s magnetic field, cyclotrons, mass spectrometers, and solenoids.
Solve multi-concept, rich-context problems in electricity and magnetism using theoretical and experimental approaches and assessment of the performance standard.
Narrate maxwell’s line of reasoning in linking em to light.
Narrate the story behind hertz’s experiments.
Relate the properties of em wave (wavelength, frequency, speed) and the properties of vacuum and optical medium (permittivity, permeability, and index of refraction).
Apply the law of reflection.
Explain the conditions for total internal reflection.
Apply snell’s law.
Explain the phenomenon of dispersion by relating to snell’s law.
Cite evidence that em wave is a transverse wave (polarization).
Calculate the intensity of the transmitted light after passing through a series of polarizers applying malus’s law.
Plan and perform an experiment involving ray optics and analyze the data – identifying and analyzing discrepancies between experimental results and theoretical expectations when appropriate.
Plan and perform an experiment involving optical polarization and analyze the data – identifying and analyzing discrepancies between experimental results and theoretical expectations when appropriate (also perform using mechanical waves).
Solve problems involving reflection, refraction, dispersion, and polarization in contexts such as, but not limited to, (polarizing) sunglasses, atmospheric halos, and rainbows.
Narrate the story behind young’s two-slit experiments (wave versus particle).
Determine the conditions (superposition, path and phase difference, polarization, amplitude) for interference to occur emphasizing the properties of a laser (as a monochromatic and coherent light source).
Predict the occurrence of constructive and destructive reflection from thin films based on their thickness, index of refraction, and wavelength of illumination.
Relate the geometry of the diffraction experiment setup (slit size, and screen-to-slit distance) and properties of light (wavelength) to the properties of the diffraction pattern (width, location, and intensity of the fringes).
Explain the photoelectric effect using the idea of light quanta or photons.
Explain qualitatively the properties of atomic emission and absorption spectra using the concept of energy levels.
Calculating radioisotope activity using the concept of half-life.
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