Electricity & Electronics (1017580BNR) June 19, 2021
First name: Last name:
Please write down your name on each page and use the space below each question. The duration of the exam is
three hours, including the part on Photonics. The only electronic equipment you can use is a pocket calculator.
The Electricity & Electronics module weights for 13 out of 20 points. Prof. Dr.-Ing. Colas Schretter
Q1. Light bulb
Strike through the invalid statements [in brackets] in the following text:
— In the circuit below, a 300mA light bulb is connected to the two poles of a 1.5V AA battery. The two
components are connected in [series / parallel]. The battery [generates / pushes] electrons thanks to a [chemical
/ electromagnetic] reaction inside the pile. The electrons move from the [negative to positive / positive to
negative] poles, and pass along the light bulb’s filament. This filament is a coil that emits light by [converting
electrons into photons through the electromagnetic effect / heating up to about half the surface temperature of
the sun]. The filament is very thin for [increasing / decreasing] the resistance to the flow of electrons. If we
double the length of the filament, the light intensity will [increase / decrease] by a factor [two / four].
↳ V R ↑
stays same a
BC
p =
V =R
=>
>
- PY
Circuit 1 Circuit 2
Q2. Waveform
Which values for the parameters of the equation y = A cos(2fif x + „) + C could redraw the information carrier
waveform in the graph below? (Hint: many solutions are possibles)
↑ A= 2
f
f= 0 S >
S
< .
A
c -
> „= -
0 .
5 or + 1 5
.
A
how much the
↑
was
Y
curve
1 pushed right =
C= -
or left)
~
↓ Chow much curve
was pushed down)
First name: Last name:
Please write down your name on each page and use the space below each question. The duration of the exam is
three hours, including the part on Photonics. The only electronic equipment you can use is a pocket calculator.
The Electricity & Electronics module weights for 13 out of 20 points. Prof. Dr.-Ing. Colas Schretter
Q1. Light bulb
Strike through the invalid statements [in brackets] in the following text:
— In the circuit below, a 300mA light bulb is connected to the two poles of a 1.5V AA battery. The two
components are connected in [series / parallel]. The battery [generates / pushes] electrons thanks to a [chemical
/ electromagnetic] reaction inside the pile. The electrons move from the [negative to positive / positive to
negative] poles, and pass along the light bulb’s filament. This filament is a coil that emits light by [converting
electrons into photons through the electromagnetic effect / heating up to about half the surface temperature of
the sun]. The filament is very thin for [increasing / decreasing] the resistance to the flow of electrons. If we
double the length of the filament, the light intensity will [increase / decrease] by a factor [two / four].
↳ V R ↑
stays same a
BC
p =
V =R
=>
>
- PY
Circuit 1 Circuit 2
Q2. Waveform
Which values for the parameters of the equation y = A cos(2fif x + „) + C could redraw the information carrier
waveform in the graph below? (Hint: many solutions are possibles)
↑ A= 2
f
f= 0 S >
S
< .
A
c -
> „= -
0 .
5 or + 1 5
.
A
how much the
↑
was
Y
curve
1 pushed right =
C= -
or left)
~
↓ Chow much curve
was pushed down)
