Lesson 7 The Electrical Circuit and Ohm's Law

When a circuit is open, voltage does not exist in the circuit.

'False'.

For a given circuit, if the resistance is decreased, the net result will be a decrease in current flow by the same percent, and thus the current is inversely related to the resistance in the circuit.

'False'. If the resistance is decreased, the net result will be an increase in current flow by the same percent; thus, the current is inversely related to the resistance in the circuit.

A circuit is defined as a completed path for voltage to flow from a source of voltage through a load and back to the source.

'False'. A circuit is defined as a completed path for current to flow from a source of current through a load and back to the source.

Ohm's Law states that it takes 1 amp to push 1 ohm of resistance through 1 volt.

'False'. Ohm's Law states that it takes 1 volt to push 1 amp through 1 ohm of resistance.

Before current can flow in a circuit, the circuit must be closed.

'True'.

For a given circuit, if the source voltage is increased, the current flowing through the resistance increases by the same percent, and thus is directly proportional.

'True'.

Prefix multipliers are used to simplify the printing and use of small or large figures.

'True'.

The metric prefix for 1,000,000 is Mega or M.

'True'.

When using the pie diagram, cover the factor I, E, or R, you wish to determine. The diagram will then indicate if the other two factors are multiplied together, or if one is divided into the other.

'True'.

The value 120 kV is equal to ? . a. 1,200 V b. 12,000 V c. 120,000 V d. 1.2 MV

120,000 V

The value 200,000 ohms can also be expressed as ? .

200 kΩ

What mathematical equation is used where I and R are known, and E is to be determined?

E=IxR

What mathematical equation is used where E and R are known, and I is to be determined?

I=E/R

The value 0.000001 Amp can also be expressed as ? a. 0.001 mA b. 0.01 mA c. 1 µA d. a. or c. e. b. or c.

Option D: "a. or c."

Resistance in a circuit and in Ohm's Law is represented by the letter ? .

R

What mathematical equation is used where E and I are known, and R is to be determined?

R=E/I

A complete circuit or path is often referred to as a(n) ? circuit.

closed

When current does not flow in a circuit, it is called a(n) ? circuit.

open

A short circuit causes a drastic decrease in the ? of the circuit and could cause the ? to be dangerously high.

resistance / current flow

Many non-electrical people often call an open circuit a(n) ? circuit.

short

When current finds an alternate path back to the source, rather than taking a path through the load, it is called a(n) ? circuit.

short

Current flow in an electrical circuit is caused by ? and opposed by ? .

voltage / resistance

The metric prefix for Micro is ? .

µ