Ch 7 electricity

__________ is the push that causes charges to move.

• Voltage Difference
• Resistance
• Induction
• Static

Which of the following statements about electric charges is true?

• Electrical forces act at a distance.
• Objects must be touching one another to exert electrical force.
• Air cannot conduct electricity, it is conducted only by solid materials.
• Opposite electric charges always repel one another.
  

A(n) __________ is a closed, conducting path.

• Circuit
• Current
• Resistor
• Ampere

The law of conservation of charge states that __________.

• charge is not created or destroyed or transferred from object to object
• the mass of all substances present before a chemical change equals the mass of all the substances remaining after the change
• charge can be created and destroyed but can not be transferred
  
• electric charge is not created or destroyed

In which type of circuit are there two or more branches for current to move through?

• Open
• Uniform
• Parallel
• Series

According to Ohm's law, as the resistance in a circuit __________, the current __________.

• increases, remains constant
• decreases, decreases
• increases, doubles
• increases, decreases
  

In which type of circuit does current have only one loop to flow through?

• series
• uniform
• open
• parallel

The process of transferring charge by touching is called __________.

• covalent charging
• charging by contact
• electron exchange
• charge conveyance
  

The purpose of fuses and circuit breakers is to _________.

• prevent circuits from overheating
• prevent breaks in the circuit
• decrease the resistance in a series circuit
• allow circuits to be overloaded
  

Electric current in a circuit is measured in _________.

• Ohms
• Watts
• Volts
• Amperes