A) Giselle and Anna decided to impress their physical science professor with a s
ID: 1705739 • Letter: A
Question
A) Giselle and Anna decided to impress their
physical science professor with a simple ex-
periment investigating the resistance of a 100
W lighbulb. They used a VARIAC (which
provides a variable voltage to a circuit) in a
series circuit with one 100-W lightbulb. They
measured the current and voltage, which are
listed in the following table.
Voltage (Volts) Currents (amps)
120 0.81
100 0.72
80 0.62
60 0.51
40 0.40
20 0.23
Does the resistance of the lighbulb increase
or decrease for each voltage and current setting?
1. The resistance decreases with both volt-
age and current.
2. The resistance remains constant with
both voltage and current.
3. The resistance increases with both voltage
and current.
4. Cannot be determined from the information
B) From your personal experience, can you pre-
dict whether the temperature of the filament
of the lightbulb increases or decreases with
the voltage?
1. Voltage has no effect on resistance.
2. The higher the temperature the higher
the resistance
3. The lower the temperature the higher the
resistance
Explanation / Answer
if the values of resistances are calculated then one can see the resistances increase with both voltage and current.[R=V/I] 1.148.14 2.138.8 3.129.0 4.117.6 5.100 6.86.9 Resistance increases with temperature .in the question resistance increased with voltage.so in this question temperature increases with voltage