Complete module assessment with 15 multiple choice questions and 5 written-response questions grounded in this module's lesson content.
Q1. Two like charges are brought closer together. The electrostatic force:
Q2. Electric field direction is defined as the direction of force on:
Q3. Electric potential difference is best interpreted as:
Q4. A charge q in a uniform electric field E experiences force:
Q5. For an ohmic resistor, doubling voltage while resistance stays constant:
Q6. In a series circuit, the same quantity through every component is:
Q7. In a parallel circuit, each branch has the same:
Q8. To analyse a mixed circuit, the best first step is usually to:
Q9. Electrical power can be calculated using:
Q10. A fuse protects a circuit by:
Q11. Household electrical energy use is commonly billed in:
Q12. Magnetic field lines around a bar magnet outside the magnet run:
Q13. Around a long straight current-carrying wire, magnetic field lines are:
Q14. Increasing the number of turns per metre in a solenoid:
Q15. The direction of a magnetic field around a current is found using:
Q16. Compare electric force, electric field, electric potential energy and potential difference.
Q17. Explain how current, voltage and resistance behave in series and parallel circuits.
Q18. A 240 V heater draws 8.0 A for 30 minutes. Calculate its power and energy use in kWh, then explain why a fuse is needed.
Q19. Describe magnetic field lines for a bar magnet, a straight current-carrying wire and a solenoid.
Q20. Explain how the concepts of field and circuit help describe forces and energy transfer in electricity and magnetism.
Q1: B
Q2: C
Q3: D
Q4: A
Q5: B
Q6: D
Q7: C
Q8: A
Q9: B
Q10: D
Q11: C
Q12: A
Q13: D
Q14: B
Q15: C
Electric force is the push or pull between charges described by Coulomb's Law. Electric field is force per unit positive charge, so E = F/q and points in the force direction for a positive test charge. Electric potential energy is stored energy due to charge position in a field. Potential difference is energy transferred per unit charge, V = W/q.
Marks: 1, force | 1, field | 1, potential energy | 1, potential difference | 1, correct relationships
In series circuits the current is the same through every component because there is only one path. The supply voltage divides across components and total resistance is the sum of individual resistances. In parallel circuits each branch has the same voltage as the supply. Current divides between branches and total resistance is less than the smallest branch resistance, found using reciprocal addition.
Marks: 1, series current | 1, series voltage/resistance | 1, parallel voltage | 1, parallel current | 1, equivalent resistance
Power is P = VI = 240 x 8.0 = 1920 W = 1.92 kW. Thirty minutes is 0.50 h, so energy use is E = Pt = 1.92 x 0.50 = 0.96 kWh. A fuse is needed because excessive current can overheat wiring and cause fire. The fuse melts when current exceeds its rating, opening the circuit and stopping energy transfer.
Marks: 1, power formula | 1, correct power | 1, kWh conversion | 1, fuse action | 1, safety reason
A bar magnet has field lines that leave the north pole and enter the south pole outside the magnet, forming closed loops overall. A straight current-carrying wire has concentric circular field lines around the wire, with direction found by the right-hand grip rule. A solenoid acts like a bar magnet, with a strong, nearly uniform field inside and poles set by the current direction. More turns per metre and larger current strengthen the field.
Marks: 1, bar magnet direction | 1, closed-loop idea | 1, wire circles | 1, right-hand rule | 1, solenoid field and strength
Fields describe how charges and magnets exert forces without contact. Electric fields transfer energy to charges when they move through potential differences. Circuits provide closed paths for charge flow, with voltage supplying energy per charge and components transforming electrical energy into other forms. Currents also produce magnetic fields, linking moving charge to magnetism in wires and solenoids.
Marks: 1, fields and forces | 1, potential difference energy | 1, closed circuit current | 1, component energy transformations | 1, current creates magnetic field
I have completed this module assessment and reviewed the answers.