3T circuits recap 5.1&5.2

• Natuurkunde
• Middelbare school
• vwo
• Leerjaar 3

The plan for today

1. What do you still know?

           > Electrical charge

           > Electrical current

           > Ohm's law

           > NTC and PTC resistors

2. Start with paragraph 3 --> How can we connect resistors?

True or false:
Two positive charges attract
eachother.

1. True
2. False

True or false:
Electrical charges can 'jump'
from one object to another.

1. True
2. False

What do we call the particles
that flow in an electrical
circuit?

1. Positrons
2. Protons
3. Electrons
4. Neutrons

What is the symbol and unit
for electrical charge?

1. Symbol: Q Unit: V
2. Symbol: C Unit: Q
3. Symbol: Q Unit: C
4. Symbol: U Unit: V

In a copper rod, we measure
10 C moving past in 20 seconds.
Calculate the current through this rod.

In a different copper rod, we
measure 6.25*10 electrons moving past in 1 second. Calculate the current through this rod.

17

If we increase the voltage
across an ohmic resistor, the
current through that resistor will ...

1. Increase
2. Decrease
3. Stay the same

During an experiment, we connect
a microchip (600 Ω) directly to a voltage source of 12V. Calculate the current through the microchip.

If we increase the temperature,
the resistance of an NTC will ...1...
and the resistance of a PTC will ...2...

1. 1: Increase 2: Increase
2. 1: Increase 2: Decrease
3. 1: Decrease 2: Increase
4. 1: Decrease 2: Decrease

Is this an NTC or PTC?

1. NTC
2. PTC