Ohm's Law

1. What is the resistance of a wire which has 33 A flowing through it when hooked up to a 12-volt battery. 0.36 ohms

2. How much current will flow through a person whose resistance is 5 MΩ (5 million ohms) when they accidentally touch a 120-volt wire? 0.000024 A

3. What are the color stripes for resistors with the following values, all with a tolerance (accuracy) of 5%?

(a) 220 Ω red-red-brown-gold
(b) 1.5 kΩ brown-green-red-gold
(c) 4.7 MΩ yellow-violet-green-gold

4. What is the resistance, and accuracy, of a resistor with the following stripes?

(a) brown-black-yellow-silver 100 kilohms, plus-or-minus 10%
(b) green-blue-blue-gold 56 megohms, plus-or-minus 5%
(c) orange-orange-orange   33 kilohms, plus-or-minus 20%

5. What are the color stripes for resistors with the following values?

(a) 470 Ω± 5%   yellow-violet-brown-gold
(b) 2.0 MΩ± 20%   red-black-green
(c) 1.5 MΩ± 10%   brown-green-green-silver

6. What is the resistance, and tolerance, of a resistor with the following stripes?

(a) brown-red-yellow-gold   120 kilohms plus-or-minus 5%
(b) blue-grey-yellow  680 kilohms plus-or-minus 20%
(c) brown-black-brown-silver   100 ohms, plus or minus 10%

7. If you have a 5-volt power supply, and you want to limit the current to 15 mA (0.015 A), what value resistor should you use? 333 ohms

8. If you have a 1.2 kΩ resistor with 150mA of current running through it, what voltage must be driving the current through it? 180 V