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HSC (New South Wales) Electrical Circuits — practice questions

Explore 27 free Electrical Circuits questions in HSC (New South Wales) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Electrical Circuits questions and exercises with answers

Showing questions 1–27 of 27.

The SI unit of electric current, the ampere, is named in honor of which scientist?Read the answer and worked solution →One ampere of current is equivalent to which rate of charge flow?Read the answer and worked solution →Which materials are given as examples of ohmic conductors?Read the answer and worked solution →What term describes a material that does NOT follow Ohm's law?Read the answer and worked solution →A 16 microfarad capacitor is charged to 9.0 V by a battery over a period of 1 minute. What is the average charging current?Read the answer and worked solution →An automobile headlight has 2.50 A flowing through it when 12.0 V is applied across it. What is its resistance?Read the answer and worked solution →A graph of current versus voltage for a circuit is a straight line whose slope is 0.001 A per 1 V. What is the resistance of the circuit?Read the answer and worked solution →A charge of 10 nC flows through a circuit in 3.0 x 10^-6 s. What is the current during this time?Read the answer and worked solution →How long would it take a steady 10 mA current to deliver 5.0 mC of charge to a capacitor?Read the answer and worked solution →A current of 0.025 A flows through a 10 ohm resistor. What is the voltage drop across the resistor?Read the answer and worked solution →6 C of charge traverses a 100 ohm resistor in 1 minute. What voltage is needed to drive this charge through the resistor?Read the answer and worked solution →A 100 ohm resistor has 12 V across it. What current flows through it?Read the answer and worked solution →What resistance is required to draw 0.15 A from a 9.0 V battery?Read the answer and worked solution →What is a circuit diagram?Read the answer and worked solution →How are elements 'in series' defined in a circuit?Read the answer and worked solution →Resistors connected one after the other in the same branch of a circuit are said to be connected how?Read the answer and worked solution →Two 80 ohm resistors are connected one after the other, and a current of 0.15 A flows through them. What is the total voltage drop across the two resistors?Read the answer and worked solution →Three resistors of 10 ohm, 25 ohm, and 15 ohm are connected in parallel across a 3 V battery. What is the equivalent resistance of the combination?Read the answer and worked solution →Ten identical resistors, each of resistance R, are connected in parallel. What is the equivalent resistance of the combination?Read the answer and worked solution →A 10 ohm resistor is connected in parallel with a second resistor R, giving a combined equivalent resistance of 8 ohm. What is the value of R?Read the answer and worked solution →In that same circuit, the blue branch draws 0.80 A and the red branch draws 0.60 A from the 12 V battery. What is the total current supplied by the battery?Read the answer and worked solution →A 45 ohm resistor and a 60 ohm resistor are wired in parallel with each other. What is their combined resistance?Read the answer and worked solution →How is electric power defined in terms of energy?Read the answer and worked solution →A resistor of 100 ohm is connected across a 12 V source. What electric power is dissipated in the resistor?Read the answer and worked solution →A circuit has 0.12 A flowing through it across a potential drop of 3.0 V. What power is dissipated?Read the answer and worked solution →An older incandescent light bulb is rated at 60 W and operates at 120 V. What current flows through it?Read the answer and worked solution →Three 10 ohm resistors are connected in parallel across a 9.0 V battery. What power is dissipated in the circuit?Read the answer and worked solution →

Worked practice questions

The SI unit of electric current, the ampere, is named in honor of which scientist?

  1. Georg Simon Ohm
  2. Andre-Marie Ampere
  3. Benjamin Franklin
  4. Alessandro Volta
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Correct answer: B. Andre-Marie Ampere

1. The unit of electric current, the ampere, is stated to be named after a French physicist. 2. That physicist is identified by name as Andre-Marie Ampere. 3. Ohm, Franklin and Volta are each linked to other facts about current and resistance, not to naming the ampere. _Source: OpenStax Physics (CC BY 4.0), Ch 19 "Electrical Circuits", section 19.1 Ohm's law_

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One ampere of current is equivalent to which rate of charge flow?

  1. One coulomb per hour
  2. One joule per second
  3. One coulomb per second
  4. One volt per second
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Correct answer: C. One coulomb per second

1. The definition of the ampere links it directly to coulombs and seconds. 2. One ampere is stated to equal one coulomb per second, written 1 A = 1 C/s. 3. Joules per second is the unit of power, not current, so that option does not match. _Source: OpenStax Physics (CC BY 4.0), Ch 19 "Electrical Circuits", section 19.1 Ohm's law_

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Which materials are given as examples of ohmic conductors?

  1. Copper, aluminum, and silver
  2. Rubber, glass, and wood
  3. Only pure silicon and germanium
  4. Salt water and human nerve tissue
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Correct answer: A. Copper, aluminum, and silver

1. Ohmic materials are those for which Ohm's law holds over a wide range of voltage and current. 2. Good conductors named as examples of ohmic materials are copper, aluminum, and silver. 3. Rubber, glass, wood, salt water, and nerve tissue are not given in this list. _Source: OpenStax Physics (CC BY 4.0), Ch 19 "Electrical Circuits", section Resistance and Ohm's Law_

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