Electrical Systems: Exam Questions
Review key concepts in electrical systems by answering questions about potential difference, current flow in parallel circuits, and resistor combinations. Practice identifying the correct instruments for measuring electrical properties and calculating current readings in circuits. Study the diagrams and apply your knowledge of electrical circuits.
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24 questions ready
Start with a quiz
Answer from memory first, then review the rationales and revisit weak areas from this set.
Activities
Quiz24 Questions
Flashcards19 Cards
Study Notes1 Note
List of Questions24 questions
- Question 1
- An ammeter connected in parallel.
- An ammeter connected in series.
- A voltmeter connected in series.
- A voltmeter connected in parallel.
- Question 2
- 3 A
- 1.5 A
- 12 A
- 24 A
- Question 3
- A single series combination of $2\Omega$, $3\Omega$, and $4\Omega$ resistors.
- A combination with $2\Omega$ and $3\Omega$ in parallel, then in series with $4\Omega$.
- A combination with $2\Omega$ in series with parallel $3\Omega$ and $4\Omega$ resistors.
- A parallel combination of $2\Omega$, $3\Omega$, and $4\Omega$ resistors.
- Question 4
- 1 m length, 1 mm diameter
- 3 m length, 1 mm diameter
- 3 m length, 3 mm diameter
- 1 m length, 3 mm diameter
- Question 5
- Increased ease of electricity transfer between different socket pins.
- A significant increase in current causing excessive heat, potentially leading to fire.
- The inability to remove one appliance without affecting others connected.
- Over-reliance of multiple appliances on a single electrical supply point.
- Question 6
- The paper clips will vibrate but not move towards the nail.
- The paper clips will be attracted to the iron nail.
- The paper clips will repel from the iron nail.
- The paper clips will remain unaffected by the iron nail.
- Question 7
- Inserting a soft iron core inside the coil.
- Using a non-magnetic core material.
- Increasing the current flowing through the coil.
- Increasing the number of turns in the coil.
- Question 8
- Electromagnets can be turned on or off and their strength varied.
- Electromagnets are always weaker than bar magnets.
- Bar magnets require an external power source, unlike electromagnets.
- The magnetic field of an electromagnet cannot be easily controlled.
- Question 9
- The insulation makes the wire less conductive, reducing efficiency.
- Frayed cords reduce the overall voltage, making appliances not work properly.
- Bare wires increase the wire's resistance, leading to less current flow.
- Exposed wires can touch, creating a low-resistance path, causing excessive current and heat.
- Question 10
- Overloading electrical sockets with multiple appliances.
- Using appliances with frayed or damaged cords.
- Touching electrical outlets with wet hands.
- Ensuring electrical appliances are properly earthed.
- Question 11
- $1/R_T = R_1 + R_2$
- $R_T = (R_1 \times R_2) / (R_1 + R_2)$
- $R_T = R_1 - R_2$
- $R_T = R_1 + R_2$
- Question 12
- $18\Omega$
- $2\Omega$
- $14\Omega$
- $20\Omega$
- Question 13
- 2 V
- 6 V
- 10 V
- 12 V
- Question 14
- 0.86 A
- 1.71 A
- 0.14 A
- 2.14 A
- Question 15
- 2.4 kWh
- 0.6 kWh
- 1.2 kWh
- 4.8 kWh
- Question 16
- $0.170
- $0.200
- $0.144
- $0.252$
- Question 17
- An electric oven
- An electric kettle
- An electric iron
- An electric drill
- Question 18
- A3 and A4
- A1 and A4
- A2 and A3
- A1 and A2
- Question 19
- To prevent the fuse from blowing due to minor fluctuations.
- To regulate the internal temperature like a thermostat.
- To prevent the heating element from overheating and burning out.
- To protect the user from a potential electric shock if a fault occurs.
- Question 20
- Voltage
- Resistivity
- Current
- Conductivity
- Question 21
- Resistance
- Voltage
- Power
- Current
- Question 22
- Ohm ($\Omega$)
- Ampere (A)
- Volt (V)
- Watt (W)
- Question 23
- Electric power
- Electric current
- Electrical resistance
- Potential difference
- Question 24
- Coulomb (C)
- Volt (V)
- Ampere (A)
- Ohm ($\Omega$)
List of Flashcards19 flashcards
- Card 1HintThink about the device used for voltage and its connection type.Memory TipVoltmeter: Voltage is measured 'across'.
- Card 2HintConsider how adding more paths affects the overall resistance.Memory TipParallel flow, lower resistance.
- Card 3HintThink about 'length' and 'thickness' of the wire.Memory TipLong and thin, high resistance.
- Card 4HintWhat happens when you plug too many things into one outlet?Memory TipToo many plugs, fire danger.
- Card 5HintConsider the current and the coil's structure.Memory TipMore current, more turns, stronger.
- Card 6HintHow is an electromagnet different from a regular magnet in terms of control?Memory TipOn-off control, adjustable strength.
- Card 7HintWhat happens if wires touch where they shouldn't?Memory TipFrayed wire, short circuit, fire.
- Card 8HintThink about insulation and interaction with water.Memory TipInsulate wires, keep dry hands.
- Card 9HintRecall the two main formulas for combining resistors.Memory TipSeries add, parallel inverse sum.
- Card 10HintWhat units are involved in 'kilowatt-hours'?Memory TipPower times time equals energy.
- Card 11HintHow do utility companies charge for electricity usage?Memory TipEnergy amount times unit cost.
- Card 12HintIt's a safety device that prevents overcurrent.Memory TipFuse: overcurrent, circuit break.
- Card 13HintWhich appliance is not designed to produce heat?Memory TipDrill heats, unwanted energy.
- Card 14HintThink about uniform flow in a single path.Memory TipSeries current: always equal.
- Card 15HintWhat happens if there's a fault in an appliance's casing?Memory TipEarth wire, shock protection.
- Card 16HintMatch resistivity, current, potential, and their units.Memory TipCopper low R, I in A, V in V, R in Ω.
- Card 17HintWhat is the danger of water and electricity?Memory TipWater conducts, switch off power.
- Card 18HintIs the material of a pencil conductive?Memory TipPencil conducts, shocking risk.
- Card 19HintWhat happens if a path for current is incomplete?Memory TipOpen switch, no complete path.