# Electronics - Voltage and Current

Exercise : Voltage and Current - General Questions
1.
What is the color code for a 220 5% resistor?
Red, Red, Brown, Gold
Orange, Orange, Black, Gold
Red, Red, Black, Gold
Red, Red, Brown, Silver
Explanation:
```Resistor colour coding series:

Black   0
Brown   1
Red     2
Orange  3
Yellow  4
Green   5
Blue    6
Violet  7
Gray    8
White   9
None    20%
Silver  10%
Gold    5%

Therefore Red, Red, Brown, Gold
2    2    101    5%

= 22 x 10 = 220 ohm 5% (tolerance).

```

Video Explanation: https://youtu.be/8YHFQCqBGcA

2.
If 60 J of energy are available for every 15 C of charge, what is the voltage?
4 V
60 V
15 V
0.25 V
Explanation:
No answer description is available. Let's discuss.

3.
An atom's atomic number is determined by the number of:
neutrons minus protons
protons
electrons
neutrons
Explanation:
No answer description is available. Let's discuss.

4.
A voltage will influence current only if the circuit is:
open
insulated
high resistance
closed
Explanation:
No answer description is available. Let's discuss.

5.
Which resistive component is designed to be temperature sensitive?
Thermistor
Rheostat
Potentiometer
Photoconductive cell