electromotive forces and kirchhoff’s law

electromotive force is______?

• work done to by the source to drive a unit charge around a complete circuit.

• amount of light produced by a bulb

• amount of heat produced by a resistor

• amount of force produced by an electric motor

e.m.f is measured across any component of electric circuit.

• True

• False

e.m.f can only be measured across the source of electric current.

• True

• False

potential difference across a component in a circuit is the work done to drive a unit charge through that component.

• True

• False

potential difference across the source of the current is e.m.f of they source

• true

• false

e.m.f and potential difference are same because they both are defined as the work done to drive a unit charge around the complete circuit.

• false

• true

e.m.f is a force

• true

• false

•Electromotive = potential + voltage

force difference loss

E = V + v

E = V + Ir

Internal resistance, r = ?

• (E – V)

  2I

• (V – E)

  I

• (E – V)

  I

• (I – V)

  E

Which statement is FALSE about EMF?

• Energy supply by a source to transfer a unit charge from one terminal to another terminal

• No current flow in the circuit, voltmeter readings = e.m.f

• 
• There is current flow in the circuit. voltmeter readings = p.d across resistance

The cell has internal resistance, r, and electromotive force of 1.5 V.
What is the reading of voltmeter when the switch is closed?

• More than 3.0 V
• Less than 1.5 V
• More than 1.5 V
• 1.5 V