magnetic effects of electric current

The magnetic field lines are__________.

• closed curves

• open curves

• semi circular

The relative strength of the magnetic field is shown by the degree of closeness of the field lines.

• false

• true

• can't say

No two field-lines are found to cross each other.

• true

• false

Fuse wire has high melting point. True or False:

• True

• False

• May be false

• May be correct

Which word means how hard it is for electrons to flow?

• Current
• Voltage
• Resistance
• Power

This is an example of a _______ circuit

• open
• series
• parallel
• square

What is resistance measured in?

• Ω (Ohms)
• V (Volts)
• A (Amps)
• W (Watts)

What is the unit of power?

• Ohms

• Volts
• Amps
• Watts

Voltage is simply defined as...

• what 'pushes' electrons
• what 'stops' electrons
• moving electrons

Where is Earth's magnetic field the strongest?

• poles

• equator

• mountain tops

• ocean floor