Exercise 4.2 A

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

a) Define the total resistance. b) How high is the resistance with one resistor? The components in the video are standard resistors with the same resistance.

Answer: a) $440\ \Omega$, b) $220\ \Omega$

Exercise 4.2 B

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Define the resistance of a component.

Tip: Measure voltage and electric current. Move the data (I, U) -coordinate system. What do you find out?
Answer: $210\ \Omega$

Exercise 4.2 C

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

a) Define the total resistance. b) How high is the resistance with one resistor? The components in the video are standard resistors with the same resistance.

Answer: a) $110\ \Omega$, b) $210\ \Omega$

Exercise 4.2 D

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Specify the resistance of one lamp and the total resistance. Both lamps are similar.

Tip: For lamps in series the total resistance is the sum of resistances.
Answer: Total resistance is $18\ \Omega$; the resistance of one lamp is $9{,}0\ \Omega$

Exercise 4.2 E

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Specify the resistance of one lamp and the total resistance. Both lamps are similar.

Tip: Switching the lamps in series the total resistance is the sum of resistances.
Answer: The resistance of one lamp is $9{,}5\ \Omega$; the total resistance is $19\ \Omega$

Exercise 4.2 F

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Specify the resistance of one lamp and the total resistance. Both lamps are similar.

Answer: Total resistance is $5{,}1\ \Omega$; the resistance of one lamp is $10\ \Omega$

Exercise 4.2 G

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Determine the resistance of the lamp.

Answer: $8{,}1\ \Omega$

Exercise 4.2 H

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Determine the internal resistance of the battery.

Answer: $0{,}60\ \Omega$

Exercise 4.2 I

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Determine the resistance of the wirewound resistor per unit length.

Answer: $40{,}7 \Omega /m$

Exercise 4.2 J

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Determine the resistance of the wirewound resistor per unit length.

Answer: $40{,}5 \Omega /m$