Science Homework Help

Study Guide:

Unit 1: Electricity

Distinguish between electrical potential energy, electric potential, and potential difference. Solve problems involving electrical energy and potential difference.

Relate capacitance to the storage of electrical potential energy in the form of separated charges.

Calculate the capacitance of various devices.

Calculate the energy stored in a capacitor.

Describe the basic properties of electric current, and solve problems relating to current, charge, and time.

Calculate resistance, current, and potential difference by using the definition of resistance.

Distinguish between ohmic and non-ohmic materials, and learn what factors affect resistance.

Calculate electric power and the cost of running electrical appliances.

Interpret and construct circuit diagrams. Identify circuits as open or closed.

Deduce the potential difference across the circuit load, given the potential difference across the battery’s terminals.

Calculate the equivalent resistance for a circuit of resistors in series, and find the current in and potential difference across each resistor in the circuit.

Calculate the equivalent resistance for a circuit of resistors in parallel, and find the current in and potential difference across each resistor in the circuit.

Calculate the equivalent resistance for a complex circuit involving both series and parallel portions.

Unit 2: Magnetism

For given situations, predict whether magnets will repel or attract each other.

Describe the magnetic field around a permanent magnet.

Describe the magnetic field produced by current in a straight conductor and in a solenoid.

Use the right-hand rule to determine the direction of the magnetic field in a current-carrying wire.

Given the force on a charge in a magnetic field, determine the strength of the magnetic field.

Use the right-hand rule to find the direction of the force on a charge moving through a magnetic field.

Determine the magnitude and direction of the force on a wire carrying current in a magnetic field.

Unit 3: Electromagnetic induction

Recognize that relative motion between a conductor and a the magnetic field induces an emf in the conductor.

Explain, how changing magnetic flux produce an induced emf?

Describe how the change in the number of magnetic field lines through a circuit loop affects the magnitude and direction of the induced electric current.

Apply Lenz’s law and Faraday’s law of induction to solve problems involving induced emf and current.