Chapter 4 - Current Electricity Flashcards Preview

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Flashcards in Chapter 4 - Current Electricity Deck (10)
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1
Q

What does the process charging by friction mean

A

When a material that has gained electrons becomes negatively charged because electrons have a negative charge and the one that has lost electrons is left with a positive charge

2
Q

What do you measure the current through a component with

A

An ammeter

3
Q

How is an ammeter placed in a circuit

A

In series with the component

4
Q

What is the potential difference measured with

A

A voltmeter.

5
Q

How are voltmeters placed in a circuit

A

In parallel with the component.

6
Q

What does Ohm’s law state

A

The current through a resistor at constant temperature is directly proportional to the potential difference across the resistor.

7
Q

Why does the resistance of the filament bulb increase

A

Because the current increases

8
Q

What happens the bigger the resistance of a component

A

The smaller the current through it

9
Q

Why are parallel circuits much more useful than series circuits.

A

A beak in one part of the circuit doesn’t stop charge flowing in the rest of the circuit

10
Q

What happens when two electrically insulating materials are rubbed together

A

Electrons are rubbed off one material and deposited on the other.