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VICPhysicsQuick questions

Unit 1: How is energy useful to society?

Quick questions on Electric circuits and Ohm's law: VCE Physics Unit 1 Year 11

9short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is charge qq?
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Measured in coulombs (C). The elementary charge e=1.6×10−19e = 1.6 \times 10^{-19} C.
What is current II?
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Rate of flow of charge: I=q/tI = q / t. Measured in amperes (A). 1 A = 1 C/s.
What is voltage / potential difference VV?
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Energy per unit charge between two points: V=E/qV = E / q. Measured in volts (V). 1 V = 1 J/C.
What is resistance RR?
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Opposition to current flow. Measured in ohms (Ω\Omega).
What is wrong power formula?
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Use the form that matches your knowns: P=VIP = VI if you know VV and II; P=I2RP = I^2 R if you know II and RR; P=V2/RP = V^2/R if you know VV and RR.
What is energy units in calorimetry context?
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kWh and J both measure energy but differ by a factor of 3.6 million.
What is q1?
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State Ohm's law and define the SI unit of resistance. [2 marks]
What is q2?
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A toaster element of resistance 3030 Ω\Omega is connected to a 230230 V supply. Calculate the current drawn and the energy consumed in 44 minutes. [4 marks]
What is q3?
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Refer to the rooftop solar example. (a) Calculate the resistance of a string drawing 88 A from an 800800 V source under ideal load. (b) Determine the power dissipated in a 0.30.3 Ω\Omega cable carrying that current.

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