Electricity Physics

Which of these factors does NOT affect the resistance of a wire?

• The material the wire is made from

• The length of the wire

• The diameter of the wire

• The shape of the wire

The correct form of Ohm's Law, linking potential difference V, current I and resistance R is…

• V = I × R

• V = I + R

• V = I/R

• V = R/I

How can you describe a.c, or alternating current?

• A current with the same strength and direction all the time

• A current that varies in strength and swaps direction smoothly and regularly

• A current that has the same strength but changes direction regularly

• A current that changes strength regularly but always in the same direction

What does this graph show?

• Resistance and length of wire are proportional

• Resistance and length of wire are directly proportional

• Resistance and length of wire are inversely proportional

• Resistance and length of wire are unrelated

Why is distributing the same power through the National Grid more efficient at a lower current?

• Low voltages are safer

• High currents heat up the cables, wasting energy

• High currents get more electricity through to the consumer

• High voltages are safer

Which statement describes a series circuit?

• A single loop with the same current passing through all components

• More than one loop with the same current passing through all components

• A single loop with different currents passing through various components

• More than one loop with different currents passing through various components

Which statement is true if you increase the resistance of a variable resistor?

• A larger current flows through the resistor

• The better the resistor conducts

• The lower the current flows through the resistor

• The easier it is for electrons to pass through the resistor

Which statement describes a parallel circuit?

• A single loop with the same current passing through all components

• More than one loop with the same current passing through all components

• A single loop with different currents passing through each component

• More than one loop with different currents passing through each loop

What should the student do to obtain a range of results?

• Adjust the variable resistor

• Swap the cells

• Reverse the ammeter

• Swap the ammeter and voltmeter

Tags

NGSS.MS-ETS1-4

NGSS.MS-PS2-2

What is the total resistance of this combination of resistors?

• 2 Ohms

• 8 Ohms

• 15 Ohms

• 35 Ohms