Theory

Question 1

How is the temperature of a wire kept constant?

Answer 1

Using a switch and small currents

Question 2

Where should voltage and current be plotted on a V-I graph?

Answer 2

-Voltage on y-axis
-Current on x-axis

Question 3

What are the characteristics of a V-I graph?

Answer 3

It is a straight line that passes through the origin

Question 4

Why is a V-I graph a straight line going through the origin?

Answer 4

It shows that current and voltage are proportional for a metal wire at a constant temperature. (Known as ohms law)

Question 5

What does the strength of the magnetic field depend on?

Answer 5

The current, the number of turns in the coil, and material used in core of coil

Question 6

What is the extension of a string directly proportional to?

Answer 6

The force applied

Question 7

What are the types of apparatuses used in experiments?

Answer 7

-Spring balance or top-pan balance (mass)
-Ruler (length)
-Graduated cylinder (liquid volume)
-Stopwatch (time)
-Thermometer or sensor (temperature)
-Ammeter (electric current)
-Voltmeter (potential difference)
-Ohmmeter (resistance)
-Protractor (angle)