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Ohm's Law and Resistivity
The SPM Physics Workbook is developed under the One-School.net Free Books Project. The content of this book is strictly follow Malaysia SPM (Sijil Pelajaran Malaysia) syllabus. The aim of this project is to provide a complete electronic supplementary network for students to develop self-learning skills by breaking the spoon-feed rituals and to encourage them to compile educational information from the Internet.
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1) Which of the following graphs correctly shows a current passing through an Ohmic conductor if the temperature of the conductor remains unchanged?
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2) What is the current through an 8Ω radio when it is operating at 240V?
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3) A potential difference of 240 V applied across the heating coil of an electric kettle drives a current of 2A through the coil. Find the resistance of the coil
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4) Determine the potential difference between the ends of a wire of resistance 5Ω if 720 C passes through it per minute.
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5) The graph shows the potential difference across a wire against its current. Find the resistance of the wire from the graph.
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6)
The resistance of a resistor is affected by
I the length of the conductor
II type of the material make up of the resistor
III cross sectional area of the resistor
IV potential difference across the resistor
V temperature of the resistor
I the length of the conductor
II type of the material make up of the resistor
III cross sectional area of the resistor
IV potential difference across the resistor
V temperature of the resistor
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7)
The resistance of a wire is
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8) The figure shows the current-voltage graph of 3 difference resistors, X, Y and Z. Which of the resistors has lowest resistance?
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9) The resistance of a _______________ will falls to zero when its temperature is close to 0 K.
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10)
Which of the following is not the application or potential use of a superconductor?
Magnetic Field
A magnetic field is a region in the surrounding of a magnet which a magnetic material experiences a detectable force.
A magnetic field is a region in the surrounding of a magnet which a magnetic material experiences a detectable force.
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