Integrated Physics and Chemistry Test

In the following diagram, the voltage is 1.5 volts and the resistance is 7.5 ohms. Use Ohm's law to determine the current in the circuit.

0.2 ohms

Which of the following factors influence the electrical resistance of a circuit? 1. conductivity of the material 2. length of conducting wires 3. type of battery installed 4. diameter of conducting wires

1, 2 and 4

If the strength of the magnetic field at A is 200 units and the strength of the magnetic field at B is 50 units, what is the distance to B?

10 units

In which of the following circumstances would a current register on the galvanometer? 1. a magnet inside a solenoid 2. a magnet being pushed through a solenoid 3. a magnet being pulled out of a solenoid

2 and 3

Which of the following statements are true? 1. Positively charged objects attract other positively charged objects. 2. Negatively charged objects attract other negatively charged objects. 3. Positively charged objects attract negatively charged objects. 4. Negatively charged objects attract neutral objects. 5. Positively charged objects attract neutral objects.

3, 4, and 5

If the Earth's magnetic field is overwhelmed by charged ions, which of the following could happen? 1. induced currents in power grids 2. extreme auroras 3. damage to satellites 4. all of the above

4, all of the above

A 500-watt vacuum cleaner is plugged into a 120-volt outlet and used for 30 minutes. How much current runs through the vacuum?

4.2

If the strength of the magnetic field at B is 20 units, the strength of the magnetic field at A is ________

80 units

Why is current supplied to consumers from generating plants in the form of alternating current?

It is a much more efficient mode of transmitting electricity than direct current.

A large electrostatic generator is commonly called a(n) _________________

Van de Graaff generator

Earth's magnetic field is most likely to be overburdened due to ___________________

a solar flare

The element in an incandescent light bulb that releases light energy is ________________________

a thin tungsten filament

The Greeks studied charges using ___________

amber

Ampere showed that parallel wires carrying current in the same direction would ___________ each othet

attract

A positively charged atom or group of atoms can be called a(n) _______

cation

When you turn on a television, the electrical circuit __________

closes

The magnetic fields of Earth and several other planets are produced by =

conductive materials in motion

Ocean water conducts electrical current because it contains ____________

electrolytes

The electricity that is delivered to our homes from regional generating stations moves over transmission lines that are =

high voltage and low current

As more resistors are added to a parallel circuit, the current _____________

increases

The unit of resistance is _________

ohms

In a circuit, a battery is used to =

raise the potential of electrons

Charge q is 1 unit of distance away from the source charge S. Charge p is four times further away. The force exerted between S and q is __________________ the force exerted between S and p.

sixteen times

Electrostatic charges are created by ____________________

stripping outer electrons from substances

The unit of electric potential or electromotive force is the __________

volt