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Electricity and Magnetism

Resistors

Concept Quizzes

Ohm's law
Energy dissipation by a resistor
Ohm's law (microscopic interpretation)
Problem solving - Circuit elements

Challenge Quizzes

Resistors: Level 1-3 Challenges

Ohm's law

The above graph shows the current through a nichrome wire according to the voltage applied. If $i=\si{200\ \milli\ampere}$ and $v=\si{125\ \volt}$ ,) what is the resistance (in $\Omega$ ) of the nichrome wire?

625 1600 250 25

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by Brilliant Staff

It is known that the amount of current needed to flow through a human being in order to cause them to have ventricular fibrillation (heart attack) is about 100 mA.

What is the minimum voltage (in volts) that will cause a person who has a body resistance of $1723\ \Omega$ to have ventricular fibrillation?

17.23 58.03 580.3 172.3

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by Brilliant Staff

If a current $I=0.9\text{ A}$ flows through a resistor $R=7\ \Omega$ of length $\Delta d=5\$ m, what is the electric field strength inside the resistor?