Calculating speed - Ms Holland's Physics Site
Calculating Resistance
Resistance can be calculated from the formula resistance = voltage/current.
Resistance is measured in Ohms (Ω)
Easy questions
1. The voltage across a lamp is 12 V and the current through the lamp is 2 A. What is the resistance of the lamp?
2. The current through an ipad is 0.1A and the voltage of its power supply is 12V. What is the resistance of the ipad?
Medium questions
3. The resistance of a thermistor is 34 Ω and the current through it is 0.3 A. What is the voltage across the thermistor?
4. The voltage across an 50 Ω resistor is 6 V. What is the current through the resistor?
Hard questions
5. The resistance of an ipod shuffle is 3 kΩ and the current through it is 4 mA. What is voltage of its power source?
6. The voltage across a woman when she is struck by lightning is 33 MV and the resistance of a human being is around 1 kΩ. What current flows through the woman?
Very difficult question
7. The charge on one electron is 1.6 x 10-19 Coulombs. The electron beam in an oscilloscope has 3.4 x 107 electrons flowing per second and the accelerating voltage is 15 kV. What is the effective resistance of the space the electrons flow through?
Can you now write 4 questions of your own (easy/medium/hard/very difficult)?
Calculating Resistance
Resistance can be calculated from the formula resistance = voltage/current.
Resistance is measured in Ohms (Ω)
Easy questions
1. The voltage across a lamp is 12 V and the current through the lamp is 2 A. What is the resistance of the lamp?
2. The current through an ipad is 0.1A and the voltage of its power supply is 12V. What is the resistance of the ipad?
Medium questions
3. The resistance of a thermistor is 34 Ω and the current through it is 0.3 A. What is the voltage across the thermistor?
4. The voltage across an 50 Ω resistor is 6 V. What is the current through the resistor?
Hard questions
5. The resistance of an ipod shuffle is 3 kΩ and the current through it is 4 mA. What is voltage of its power source?
6. The voltage across a woman when she is struck by lightning is 33 MV and the resistance of a human being is around 1 kΩ. What current flows through the woman?
Very difficult question
7. The charge on one electron is 1.6 x 10-19 Coulombs. The electron beam in an oscilloscope has 3.4 x 107 electrons flowing per second and the accelerating voltage is 15 kV. What is the effective resistance of the space the electrons flow through?
Can you now write 4 questions of your own (easy/medium/hard/very difficult)?
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