electromotive force

Which circuit can be used to determine the electromotive force of a battery?

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One dry cell with e.m.f value of 2V and internal resistance 1Ω is connected to one resistor 4Ω

• 0.4A

• 0.5A

• 2.0A

• 2.5A

Determine:

(a) the e.m.f of the cell

*beza keupayaan(potential difference)

*Arus(current)

• 0.9

• 0.6

• 1.5

Determine:

(b) the internal resistance

*beza keupayaan(potential difference)

*Arus(current)

• 1 ohm

• 2 ohm

• 3 ohm

• 4 ohm

•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

y = mx + c

from graph, state the correct answer represent equation using
V, E, I and -r

• V  = -rE+I

• E  = -rI + v

• V  = -rI + E

• V  =rI +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

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