HSC (New South Wales) Electrical Circuits — practice questions
64 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice HSC (New South Wales) Electrical Circuits in the app →How is electric current defined in terms of charge and time?The SI unit of electric current, the ampere, is named in honor of which scientist?One ampere of current is equivalent to which rate of charge flow?Conventional current in a circuit is defined to flow in which direction?How do direct current (DC) and alternating current (AC) differ over time?How is resistance described as a property of a wire or circuit component?In words, what relationship does Ohm's law describe between current and voltage?Ohm's law is described as being similar in nature to the law of friction. What does this comparison mean?Which materials are given as examples of ohmic conductors?What term describes a material that does NOT follow Ohm's law?What happens to a material's resistance at very low temperatures versus very high temperatures?Who is credited with experimentally finding that current through a conductor is proportional to the voltage acA lightning strike transfers 1.0 x 10^20 electrons from a cloud to the ground in 2.0 ms, with each electron caA 16 microfarad capacitor is charged to 9.0 V by a battery over a period of 1 minute. What is the average charAn automobile headlight has 2.50 A flowing through it when 12.0 V is applied across it. What is its resistanceA graph of current versus voltage for a circuit is a straight line whose slope is 0.001 A per 1 V. What is theA charge of 10 nC flows through a circuit in 3.0 x 10^-6 s. What is the current during this time?How long would it take a steady 10 mA current to deliver 5.0 mC of charge to a capacitor?A current of 0.025 A flows through a 10 ohm resistor. What is the voltage drop across the resistor?6 C of charge traverses a 100 ohm resistor in 1 minute. What voltage is needed to drive this charge through thA 100 ohm resistor has 12 V across it. What current flows through it?What resistance is required to draw 0.15 A from a 9.0 V battery?A single resistor R is connected across a 10 V battery and 0.01 A flows. A second identical resistor R is thenHow is an electric circuit described as a physical structure?What is a circuit diagram?What is meant by an 'equivalent resistor' for a group of resistors?How are elements 'in series' defined in a circuit?Resistors connected one after the other in the same branch of a circuit are said to be connected how?What is the rule for finding the equivalent resistance of several resistors connected in series?In a series circuit with several resistors, what is true of the current and the voltage drop across each resisIn a circuit diagram, is the voltage the same at every point along a single connecting wire?Three resistors R1 = 1.0 ohm, R2 = 6.0 ohm, and R3 = 13 ohm are connected one after the other across a 12 V baFour resistors are connected one after the other so that their resistances add up to an equivalent resistance Two 80 ohm resistors are connected one after the other, and a current of 0.15 A flows through them. What is thA 9 V battery has its negative terminal connected to ground. Two separate paths run from its positive terminalIn a single loop with a battery and resistors connected one after the other, why does the current stay the samHow are resistors described as being connected 'in parallel'?Why must the equivalent resistance of several resistors in parallel always be less than the smallest of those In a group of resistors connected in parallel, what is true of the voltage drop and the current through each rThree resistors of 10 ohm, 25 ohm, and 15 ohm are connected in parallel across a 3 V battery. What is the equiThree resistors of 10 ohm, 25 ohm, and 15 ohm are connected in parallel across a 3 V battery, giving an equivaThree resistors of 10 ohm, 25 ohm, and 15 ohm are connected in parallel across a 3 V battery. Which resistor cTen identical resistors, each of resistance R, are connected in parallel. What is the equivalent resistance ofA 10 ohm resistor is connected in parallel with a second resistor R, giving a combined equivalent resistance oA circuit is built from five 10 ohm resistors and a 12 V battery. One branch, call it the blue branch, has twoContinuing the same circuit: the blue branch (15 ohm) is wired in parallel with a red branch made of two 10 ohIn that same circuit, the blue branch draws 0.80 A and the red branch draws 0.60 A from the 12 V battery. WhatA 45 ohm resistor and a 60 ohm resistor are wired in parallel with each other. What is their combined resistanTwo identical resistors are connected in parallel across the terminals of an ideal battery. If the resistance In a house, a single incoming wire at high potential relative to ground supplies electric power to the buildinIn a flashlight, the batteries are normally connected one after the other (in series) rather than in parallel.How is electric power defined in terms of energy?A resistor of 100 ohm is connected across a 12 V source. What electric power is dissipated in the resistor?A circuit has 0.12 A flowing through it across a potential drop of 3.0 V. What power is dissipated?Three correct expressions for electric power dissipated in a resistor are P = IV, P = I^2 R, and P = V^2 / R. Which statement is true regarding capacitors and electric power dissipation in a circuit?A 25-W light bulb and a 60-W light bulb both operate at the same voltage. Which bulb has the lower resistance?An older incandescent light bulb is rated at 60 W and operates at 120 V. What current flows through it?Household outlets in many countries supply 120 V AC. What does it mean that this 120 V figure is a time-averagYou want 10 W of heat output from a resistor heater powered by two 9-V batteries connected one after the otherA single 9-V alkaline battery can deliver a charge of 565 mA h. Two of these batteries are connected one afterSix 30 ohm resistors are wired into three branches connected in parallel across a 12 V battery. The middle braIn that same six-resistor circuit, the middle branch dissipates 2.4 W, the left branch dissipates 3.2 W, and tThree 10 ohm resistors are connected in parallel across a 9.0 V battery. What power is dissipated in the circu